Getting told to sign or be fired.

I have just received an E-mail from Corporate to sign "Binding Arbitration Agreement And Waiver of jury Trail" or be fired.
This is a retail company and their is a question of overtime for most. For me as Manager,it is a question of calling me a manager and working me 40 hours on the register ever week and then manage after this. I am paid hourly for 40 hours and some comission maybe (No overtime). I feel that my job is miss classified. I don't mind being worked as a manager but not on a hourly job. I have been with this company a few years and resently been told to sign this form or be fired. What should I say to not be fired. I got this Friday and they want it Monday and I don't feel right about this nor due I understand the content.