That's illegal. Just Google "Florida wage claim attorney" and chat with a few attorneys. They will generally sue the employer and force the employer to pay them, so you shouldn't have to pay up front.
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Consult an attorney. You have options to sue under the Fair Labor Standards Act, which most attorneys will handle on a contingency basis if they feel strong enough about your case, or you can file a small claims action against your employer.
If you prevail under a FLSA action, which is a much longer process, you can get double damages and an attorney will get reasonable attorney fees awarded plus costs to be paid by the employer.
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