Casey's — Local services in Tremont

Arrived 10 min before closing on a Friday night and was refused service because I was paying with cash. The girl working said she got in trouble for not dropping her drawer before midnight?? How can you close your drawer before you close? She said its card only after a certain time. No sign or anything posted that informs customers of this "rule" that I've never encountered at ANY other Casey's including the other location on Pearl St in Tremont. I walked out and they locked the door and shut all the lights out 5 min til closing. I think the employee was just trying to get out of there and already counted the money in the drawer, but if its their policy to refuse a paying customer with cash during normal business hours, they should not be...