Disciplined or Terminated - those are the employers' sole options. Discipline means "write-up/ speech", Terminate is obvious. There is no punishment, in terms of forfeited wage, altered schedules, or reduced hours. Those would be true labor issues to consult a lawyer over. Exempt employees are salaried persons - so as long as you're hourly, it's your bet to wager whether you'll lose the job <immediately> or not. Generally speaking, in this scenario, you're needed by the employer. THAT being said, let's assume they hang on to you until after the busy season, and then terminate based on some other reason (bc the OT refusal would NOT hold up in court at that point) - Go back to the discipline part now - be very careful what you sign, acknowledge, or disagree with.

Tread lightly.