Guards who have to do a double shift last second

For guards who find out last second that someone called out and now their making you stay an extra 12 hours, I don't understand, do you not have a right to say "My shift is finished, if you need someone to come in, that's not my job. Get management or get a spare guard from somewhere else." Besides, if they make you do a double shift, they HAVE TO recompense you with free food! I herd someone incline that they might have to order out of pocket. Why do I always find in this channel that guards are forced to stay? If it were me I would say "That's not my problem."