We do. The federal minimum wage is $7.25 an hour, although a few states have higher ones, up to $9.47 an hour in Washington State; a few are in the process of raising their minimum wages, one or two all the way to $15 by 2020. A couple states have 'living wage' laws, as well, but at least one (GOP-controlled Wisconsin) just repealed that law.
The GOP, as usual, is doing everything in its power to fight even the slightest increase in minimum wage, based on the theory that if companies were required to pay their employees living wages, then either every company in the nation would be forced out of business or else inflation would spiral out of control to the extent that six months later, the dollar would have the same buying power as the yen.
WalMart hands out flyers to its employees telling them how to apply for food stamps and Medicaid rather than paying them enough to pay for food. It also does not allow regular hourly workers to work more than 30 hours per week in order to minimize the number of full-time employees, and thus, legally required benefits that have to be provided. (To be fair, they have announced that they will be raising minimum pay to $10 an hour at some point in the future, but haven't addressed the union-busting or refusal to hire full-timers.