I am 60, and my mom was dunked when I was 2. In my 58+ years of being stuck in this thing, I have been in over 30 Cong's, and visited 100"s. One I was in around Atlanta back in the 80's locked both the door's and the gate's. One I visited a lot in Memphis back in the 90's, always locked the door's. Another in Hollywood, locked the door's as well. Two I visited in Chicago back in the 70's also locked the door's.
It all depends on the location!!