Lawsuits are unlike many aspects of most people's lives, unless they happen to be attorneys. While you may file a lawsuit on virtually any topic, you are unlikely to be successful if you cannot support your claims with valid evidence.
If you have been asked or allowed to work more than 40 hours in a week, then you may have been entitled to overtime pay.
Employment law cases involving discrimination, harassment, retaliation or hostile work environment are always complex. Because there are at least two parts to any case. There are what are typically described as "the facts."