Scheduled to come in then sent home.

I work for a contractor for fedex. Boss schedules people to work on days and then right before clock in time he will tell you to go home. This is an every week thing. He schedules us to come in just in case it’s heavy and he needs us. Should we not get paid for this? We are essentially on call. Sometimes people drive over an hour to the terminal then get told to go home and get no pay. Georgia