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However, you're dumber than dirt if you keep doing this. He's taking advantage of you. What if you just don't do it? You do as much as you can in the time allotted for you to get the work done. You don't get it all done. He yells at you. So what? He demands that you work until you do get everything done. You ask if you will be paid overtime, legally and all, if you do this work. If he says no, you say thanks, I'll go home. And go home. Show up for work again at the expected time. If he screams, 'You're fired!!!" then smile, thank him, and don't show back up any more.
If a boss were stupid enough to fire you for refusing to work uncompensated overtime, first of all, go home and get on the internet and file for your unemployment benefits immediately. Then call the state department of wage and hour and discuss this situation with them, discuss all the occasions you can recall of where you have worked uncompensated overtime. This is something you should probably do, even if you are still working there, have not been fired. Call and report them, which you can do anonymously, and they will not report that you were the one who called in. But in the meantime, do refuse to work any more uncompensated overtime.