If your employer "suffers" you to work, then the time must be paid. Yes, you have a claim for your unpaid wages. Have you kept track of your unpaid work time? Submit that with your complaint to the State.
In the meantime, quit working unpaid overtime. You are largely responsible for the situation you're in and your employer should have put a stop to it long ago; it's very foolish on their part that they didn't. FYI, you can be terminated for working unauthorized overtime, although if they did so know it would look like retaliation for making a wage and hour claim. I strongly suggest you stop doing this immediately.