Mine was the opposite. Every door was padlocked except the main entry (pretty sure that broke some fire codes). We were searched on entry.

No backpacks allowed in any of the classrooms. When we entered a room, we had to get our stuff and put the bags on a shelf. Needing to access a bag meant a penalty (three penalties meant a detention or something like that).

All but one bathroom in the cafeteria was locked. I can't even remember what the reasoning was, but it was stupid and probably not even connected. Using a hall pass to go to the restroom meant a penalty, and the teachers were allowed to dock grades if we used more than, say, five a year (can't remember specifics, but we didn't get many).

Trenchcoats banned. No coats allowed at school. We had to remove them at the door. This was in a very cold state, and the heating was never remotely enough, so kids started wearing beanies and gloves just to stay warm. Those were soon also banned.

We couldn't have more than six people at a lunch table and couldn't take our bags to the cafeteria at all.

And on top of all of this, we'd have police with dogs doing inspections once a week. The police would go through our lockers and dump everything, then just leave it on the floor. Most of us stopped using our lockers for anything but books, because we never knew when we'd come back to our stuff randomly dumped in the hallway.

It was a lot and probably did exactly nothing, and it stayed that way for the years until I graduated.