I used to work with a guy who used to lock the door, anyone who showed up late had to knock on the window and get begged to be let in, it disturbed the meeting

I used to work with a guy who used to lock the door, anyone who showed up late had to knock on the window and get begged to be let in, it disturbed the meeting enough to chastised the late person with a disappointed frown or jibes from the rest of the team. Very few people arrived late to his meetings, and when you where going to be late you'd let him know.