Rude security guard (woman)

My sister and i went to game liquor today within minutes before it closed thinking we were too late. We decided to also go to the game store. Assuming that it was closed, we saw the door open so we thought it was an opportunity to enter. As we entered through the door, the security guard (a woman) there spoke so rudely to us asking us to and I quote " look at the time" . We told her that we thought we could enter cause the door was still open but she rudely made us leave the store saying the door was open for leaving customers. In my experience the door should be kept closed until the customer wants to leave the store. We were baffled at the way she spoke to us today and it wasn't kind at all.