Customers receive their food at the self-service counter in the Yaoji Chaogan traditional Beijing cuisine restaurant, which then-Vice President Joe Biden visited in 2011, in Beijing, China, November 9, 2020. REUTERS/Thomas Peter

People buy tickets for a movie session at a self-service kiosk during the reopening of cinemas, amid the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil October 1, 2020. REUTERS/Pilar Olivares

Service members of the self-proclaimed Donetsk People's Republic (DNR) sit next to a howitzer during military exercises at a target range outside Donetsk, Ukraine August 25, 2020. REUTERS/Alexander Ermochenko

Service members of the self-proclaimed Donetsk People's Republic (DNR) ride during military exercises at a target range outside Donetsk, Ukraine August 25, 2020. REUTERS/Alexander Ermochenko

Service members of the self-proclaimed Donetsk People's Republic (DNR) fire a howitzer during military exercises at a target range outside Donetsk, Ukraine August 25, 2020. REUTERS/Alexander Ermochenko

Customers use self-service mail kiosks inside the James A. Farley U.S. Postal Service (USPS) office in midtown Manhattan in New York City, New York, U.S., August 13, 2020. REUTERS/Mike Segar

Service members wearing protective face masks take part in military exercises held by the armed forces of the separatist self-proclaimed Donetsk People's Republic at a target range in Donetsk Region, Ukraine August 13, 2020. REUTERS/Alexander Ermochenko

A service member wearing a protective face mask gets onboard a Strela-10 surface-to-air missile system during military exercises held by the armed forces of the separatist self-proclaimed Donetsk People's Republic at a target range in Donetsk Region, Ukraine August 13, 2020. REUTERS/Alexander Ermochenko

Service members wearing protective face masks load a Strela-10 surface-to-air missile system during military exercises held by the armed forces of the separatist self-proclaimed Donetsk People's Republic at a target range in Donetsk Region, Ukraine August 13, 2020. REUTERS/Alexander Ermochenko

A service member wearing a protective face mask stands near a Strela-10 surface-to-air missile system during military exercises held by the armed forces of the separatist self-proclaimed Donetsk People's Republic at a target range in Donetsk Region, Ukraine August 13, 2020. REUTERS/Alexander Ermochenko

Service members wearing protective face masks take part in military exercises held by the armed forces of the separatist self-proclaimed Donetsk People's Republic at a target range in Donetsk Region, Ukraine August 13, 2020. REUTERS/Alexander Ermochenko

Customers pay for their goods at self-service checkout counters inside a Monoprix supermarket operated by Casino Group, following the outbreak of the coronavirus disease (COVID-19), in Paris, France August 7, 2020. REUTERS/Benoit Tessier

Men wash their cars at a self-service carwash in Kyiv, Ukraine July 6, 2020. REUTERS/Valentyn Ogirenko

Tsietsi Makiti, a self-styled "Pope" of Gabula Church, looks on as his congregant helps to put up a banner ahead of a service as South Africa eases some aspects of a stringent nationwide the coronavirus disease (COVID-19) lockdown, in Evaton, South Africa June 28, 2020. Picture taken June 28, 2020. REUTERS/Siphiwe Sibeko

Tsietsi Makiti, a self-styled "Pope" of Gabula Church, holds a bottle of Amarula as he preaches to his congregants during a service as South Africa eases some aspects of a stringent nationwide the coronavirus disease (COVID-19) lockdown, in Evaton, South Africa June 28, 2020. Picture taken June 28, 2020. REUTERS/Siphiwe Sibeko

Tsietsi Makiti, a self-styled "Pope" of Gabula church looks on ahead of a church service as South Africa eases some aspects of a stringent nationwide coronavirus disease (COVID-19) lockdown, in Evaton June 28, 2020. Picture taken June 28, 2020. REUTERS/Siphiwe Sibeko TPX IMAGES OF THE DAY

"Do Not Open" signs are seen on a take away food stall where used be the self service earlier at a Keels super market,amid concerns about the spread of the coronavirus disease (COVID-19), in Colombo, Sri Lanka, June 17, 2020. Picture taken June 17, 2020. REUTERS/Dinuka Liyanawatte

A "Do Not Open" sign is seen on a take away food stall where used be the self service earlier at a Keels super market, amid concerns about the spread of the coronavirus disease (COVID-19), in Colombo, Sri Lanka, June 17, 2020. Picture taken June 17, 2020. REUTERS/Dinuka Liyanawatte

Self-service kiosks are seen at a KFC restaurant offering contactless service, ahead of its opening following the easing of restrictions implemented to curb the spread of the coronavirus disease (COVID-19) in Moscow, Russia June 21, 2020. REUTERS/Evgenia Novozhenina

Customers separated by protective plexiglass shields are seen in the self-service checkout area of a Coles supermarket following the easing of restrictions implemented to curb the spread of the coronavirus disease (COVID-19) in Sydney, Australia, June 17, 2020. REUTERS/Loren Elliott

Customers separated by protective plexiglass shields are seen in the self-service checkout area of a Coles supermarket following the easing of restrictions implemented to curb the spread of the coronavirus disease (COVID-19) in Sydney, Australia, June 17, 2020. REUTERS/Loren Elliott

A woman wearing a protective face mask uses a self-service payment kiosk, amid the outbreak of the coronavirus disease (COVID-19) in central Kiev, Ukraine June 12, 2020. REUTERS/Gleb Garanich

A vending machine of Swiss self-service retailer Selecta is seen at Binz train station in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

The logo of Swiss self-service retailer Selecta is seen on a vending machine at the airport in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

A vending machine of Swiss self-service retailer Selecta is seen at Binz train station in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

Protective masks are displayed above snacks and drinks at a "Safety Station" vending machine of Swiss self-service retailer Selecta at the airport in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

Protective masks are displayed above snacks and drinks at a "Safety Station" vending machine of Swiss self-service retailer Selecta at the airport in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

Protective masks are displayed above snacks and drinks at a "Safety Station" vending machine of Swiss self-service retailer Selecta at the airport in Zurich, Switzerland May 28, 2020. REUTERS/Arnd Wiegmann

A package containing two single-use protection masks on sale for 3.00 francs ($3.08) is displayed between a chocolate bar and a power bank at a vending machine of Swiss self-service retailer Selecta in Zurich, Switzerland May 14, 2020. REUTERS/Arnd Wiegmann

A woman wearing a face mask shops in a self-service bakery department of a supermarket, after the federal state of North Rhine-Westphalia decided to make wearing protective masks obligatory in shops and public transportation to fight the spread of the coronavirus disease (COVID-19), in Bad Honnef near Bonn, Germany, April 27, 2020. REUTERS/Wolfgang Rattay

Employees from a disinfection service company sanitise a polling booth for voters who are self isolated for upcoming parliamentary election in Seoul, South Korea, April 14, 2020. REUTERS/Kim Hong-Ji

Employees from a disinfection service company sanitise a polling booth for voters who are self isolated for upcoming parliamentary election in Seoul, South Korea, April 14, 2020. REUTERS/Kim Hong-Ji

An empty self-service petrol station is seen, as the spread of coronavirus disease (COVID-19) continues, in Naples, Italy, April 2, 2020. REUTERS/Ciro De Luca

An empty self-service petrol station is seen, as the spread of coronavirus disease (COVID-19) continues, in Naples, Italy, April 2, 2020. REUTERS/Ciro De Luca

Roberto Braga de Souza, 41, who tested positive for coronavirus disease (COVID-19) poses for a photograph as he self-isolates in his home in the city's biggest slum Paraisopolis after residents have hired a round-the-clock private medical service, in Sao Paulo, Brazil March 30, 2020. Picture taken March 30, 2020. REUTERS/Amanda Perobelli

Marcus Vinicius Conceicao dos Santos, 22, looks out from his home as he self-isolates with another 19 people after showing symptoms of coronavirus disease (COVID-19), in the city's biggest slum Paraisopolis after residents have hired a round-the-clock private medical service, in Sao Paulo, Brazil March 30, 2020. Picture taken March 30, 2020. REUTERS/Amanda Perobelli

A man wearing a face mask displays a sign for takeaway services at an eatery after New South Wales began shutting down non-essential businesses and moving toward harsh penalties to enforce self-isolation as the spread of coronavirus disease (COVID-19) reached a "critical stage" in Sydney, Australia, March 24, 2020. REUTERS/Loren Elliott TPX IMAGES OF THE DAY

A man plays at self service betting at a bookmaker as the coronavirus disease (COVID-19) outbreak continues, in London, Britain March 16, 2020. REUTERS/Kevin Coombs

People carry the coffin of a man who was one of the five musicians who were ambushed and killed by suspected Los Ardillos cartel members, after stepping out of the territory guarded by their self-defence militia, known as CRAC-PF, during a funeral service in Alcozacan, Mexico, January 29, 2020. REUTERS/Alexandre Meneghini SEARCH "MEXICO CARTEL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

People carry the coffins of five of the ten musicians who were ambushed and killed by suspected Los Ardillos cartel members, after stepping out of the territory guarded by their self-defence militia, known as CRAC-PF, during funeral services in Alcozacan, Mexico, January 29, 2020. REUTERS/Alexandre Meneghini SEARCH "MEXICO CARTEL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Men react during a funeral service held for five of the ten musicians who were ambushed and killed by suspected Los Ardillos cartel members, after stepping out of the territory guarded by their self-defence militia, known as CRAC-PF, during funeral services in Alcozacan, Mexico, January 29, 2020. REUTERS/Alexandre Meneghini SEARCH "MEXICO CARTEL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

People react during a funeral service held for five of the ten musicians who were ambushed and killed by suspected Los Ardillos cartel members, after stepping out of the territory guarded by their self-defence militia, known as CRAC-PF, during funeral services in Alcozacan, Mexico, January 29, 2020. REUTERS/Alexandre Meneghini SEARCH "MEXICO CARTEL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A person uses a self check-in service depicting Thomas Cook and Condor logos at the Frankfurt Airport, Germany September 23, 2019. REUTERS/Kai Pfaffenbach

Christophe Milon, CEO of Eco-compteur poses on a Velib' Metropole self-service public bike in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo rides a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo and International Olympic Committee (IOC) member and Co-Chairman of Paris 2024 Tony Estanguet ride a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo rides a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo rides a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo rides a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

Mayor of Paris Anne Hidalgo rides a Velib' Metropole self-service public bike by Smovengo on the newly created secure bicycle facilities in Paris, France, September 4, 2019. REUTERS/Benoit Tessier

A JD.com Logistics self-driving truck is displayed at China International Fair for Trade in Services in Beijing, China, May 28, 2019. REUTERS/Jason Lee

Britain's Queen Elizabeth stands next to a self-service checkout machine inside a replica of one of the original Sainsbury's stores in Covent Garden on the occasion of their 150th anniversary in London, Britain May 22, 2019. Jeremy Selwyn/Pool via REUTERS

Britain's Queen Elizabeth chats next to a self-service checkout machine inside a replica of one of the original Sainsbury's stores in Covent Garden on the occasion of their 150th anniversary in London, Britain May 22, 2019. Jeremy Selwyn/Pool via REUTERS

Britain's Queen Elizabeth looks at self-service checkout machine inside a replica of one of the original Sainsbury's stores in Covent Garden on the occasion of their 150th anniversary in London, Britain May 22, 2019. Jeremy Selwyn/Pool via REUTERS

Touchscreen self-service check-in machines for passenger stand at the Air France-KLM Group check-in desk inside Charles de Gaulle airport, operated by Aeroports de Paris, in Roissy, France, April 11, 2019. REUTERS/Benoit Tessier

Self-service check-in terminals are pictured at Sofia Airport, Bulgaria, April 8, 2019. Picture taken April 8, 2019. REUTERS/Stoyan Nenov

The self-service checkout area is pictured inside a Walmart store in Mexico City, Mexico March 28, 2019. REUTERS/Edgard Garrido

The logo of Monet Technologies Inc., a joint venture of SoftBank Corp and Toyota Motor Corp that will develop self-driving car services, is displayed at a news conference in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato

The logo of Monet Technologies Inc., a joint venture of SoftBank Corp and Toyota Motor Corp that will develop self-driving car services, is displayed at a news conference in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato

A mock of self-driving car e-Palette is displayed at a news conference by Monet Technologies Inc., a joint venture of SoftBank Corp and Toyota Motor Corp that will develop self-driving car services, in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato