I work for Coles Supermarkets as a night-filler. I just finished my shift and finished all my individual work but not all tasks were completed as a collective. Nobody can leave the exit door until the duty manager puts the passcode in to open the door and they are supposed to put the code in at exactly 12am. As my 10-15 co-workers and I were headed for the door my Duty Manager stopped all of us and started yelling at us for not getting everything done, even though we are supposed to leave the premises as soon as we clock out and the contracted shift is over per company policy. This manager then proceeds to threaten to lock everyone in against their will to get all the extra work done. He said “That door will stay closed and stay locked until all of you get the rest of this shit done, I'm not putting the passcode in”. Everyone just said fuck it and walked to the door so he had no choice but to put the code in. Is there anything I can do about this threat? It's the second time in my years working here that a manager has threatened to basically keep people hostage and do extra work without pay. What should I do?