Everybody wants to be fairly compensated for work time, and the Fair Labor Standards Act (FLSA) is a federal law that governs overtime. Maryland and the District of Columbia have state overtime laws the provide the same or greater protections for you.
Employers covered by the overtime laws are required to provide additional compensation to employees that spend extra time on the clock. You are due one and a half times your regular hourly wage for each hour over 40 worked in a 7-day period. For example, if you make minimum wage of $9.25 per hour, you must be paid $13.87 for each hour over 40 that you work in the 7-day period, unless you are exempt.