The answer is minimum wage.
A price floor is:
a) The lowest price a consumer can pay for a good
OR
b) The lowest price a person can be paid for a certain service.
In this case, the United States government has a price floor, which is called minimum wage. The federal minimum wage ensures that Americans in certain industries can not be paid less than a certain hourly rate. Currently, it is $7.25 an hour. However, states can create their own minimum wage for their citizens as well.