If your unreasonable employer is so small or insolvent or something that you think collecting your back overtime later, after someone else (or government) brings the legal action, is going to be blood out of a turnip, then you need to walk.

Working all this overtime and knowing the saps just _think_ they're successfully screwing you out of paying you for it is one thing. Actually letting them screw you out of paying you for work done, and letting yourself be strong-armed into doing work for no pay, is something completely different.