Delores Leonard (R) helps her daughter Erin with her homework at the breakfast table before heading to work at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT TPX IMAGES OF THE DAY) 

Delores Leonard helps her daughter Erin with her homework during breakfast in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (C) gets her daughters Erin (L) and Emmarie breakfast before heading to work at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (C) walks her daughters Emmarie (R) and Erin to school before heading to work at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard shows her daughter Erin how to make a heart symbol with her hands as she walks her to school before heading to work at a McDonald's Restaurant in Chicago, lllinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (C) walks her daughters Emmarie (L) and Erin to school before heading to work at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard kisses her daughter Emmarie as she drops her off for school in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (seated) rides a bus to her work at a McDonald's Restaurant in Chicago, lllinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard arrives to work a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard is seen working at the drive-thru window at a McDonald's Restaurant in Chicago, Illinois, September 29, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 29, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard leans on a fence as she waits for her bus after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard waits for a bus after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage, but gets some assistance with food stamps. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard shops for groceries after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage, but gets some assistance with food stamps. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard shops for groceries after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage, but gets some assistance with food stamps. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard carries her groceries home after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage, but gets some assistance with food stamps. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard rides a bus after working a shift at a McDonald's Restaurant in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage, but gets some assistance with food stamps. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

A recent paycheck for Delores Leonard shows her hourly wage of $8.25 for working at a McDonald's Restaurant, the minimum wage in Illinois, in Chicago, Illinois, September 29, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 29, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (L) makes dinner for her daughters Erin (C) and Emmarie at their home in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (L) reads a book to her daughter Erin at the dinner table at their home in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT) 

Delores Leonard (R) helps her daughters Erin (C) and Emmarie get ready for bed at their home in Chicago, Illinois, September 25, 2014. Leonard, a single mother raising two daughters, has been working at McDonald's for seven years and has never made more than minimum wage. Picture taken September 25, 2014. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS EMPLOYMENT)