What do I do if my employer won't pay me overtime?

If you are classified as a hourly employee then you could have a claim for past wages.  If however, you are labeled as a salaried employee (or exempt employee) then you do not have to be paid overtime.  An overly simplified example would be to think of a restaurant worker versus a restaurant manager.  The restaurant worker (cook) would likely be an hourly employee while the manager would be an exempt employee (salaried).