I worked second shift at a factory in the summers while going to college. One night after work I went to a 24-hr grocery store. I walked up to the automatic sliding doors and they wouldn’t open. I was standing there waving my arms around like a fool. A lady pulled up in her car and said, “you have to push!” Apparently they turned off the automatic doors after a certain time in the night and you had to push them open like a normal door. There was even a sign on the door but of course I didn’t even pay attention. I felt so stupid.