Well, first you're entitled to more than minimum wage if you're working over eight hours a day, because you're owed overtime as well. Assuming that your supervisor is also the owner and you've exhausted all recourse within the company or business itself, you can either file a formal complaint with the department of labor of whatever state the company is in or seek a civil lawsuit.
In sum:
1) Speak with the person or department in charge first
2) Than either file a formal complaint with the state labor department or seek a civil lawsuit or both
Please consult an employment attorney for legal advice.
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