My school at some point tried to be very extreme about being late. A new rule was that if you were late for even 1 minute, you won’t be allowed in the school.
I was literally walking to the door and saw a kid go in, but I wasn’t allowed in because oh I guess I was a few seconds too late.
Me and other teenagers crowded around the front door and the exchange was basically this
“So you won’t let us in?”
“No, you were late. Go home.”
And we all shrugged and took the day off. Needless to say the rule didn’t last very long and there were many angry parents.