Just wanted to update my thread. First, I apologize for the typo I made yesterday. I was typing on my phone and pretty upset, so I used my computer and edited the new post. My coworker was the one who let the girl in, not me (hence why I was pretty mad). There are two doors, a door to get into the ATM foyer (open all the time) and one to get into the bank. The hours are posted on the first door, but not the second.
Anyway, I ended up texting my boss to ask her if we could have a conversation on Tuesday about what happened, and she just called me so we had a conversation about it. She agreed with me 100 percent. Banks should not stay open past closing-bank robbers study patterns and habits of a bank and thats how they figure out when the best time to rob it is. She was pretty mad that my coworkers didn't stick up for me, but we agreed not to tell them about our conversation unless it became an issue. Since I work all Sundays, she suggested to me that since we don't have a security guard, have one of the two tellers that is working close a little early and act as a doorman of sorts, standing by the door to make sure nobody gets in. She was also going to call the lady that forced her way in and explain that it's a security breach to come that close to closing.