> Schedule any meetings that really require 1 hour over lunch.
For the love of God no. This almost always ends up turning into an excuse for managers to make your lunchtime into work time.
> If our meeting is scheduled for 10:00 and you're not there by 10:01, I lock the door.
I get that it's important to be punctual, but isn't this a bit extreme?
If your meeting is scheduled for 30 minutes, then 1 minute of delay is already 3.3% of the meeting wasted. 5 minutes of typical courtesy buffer is almost 17%! It may be important if your schedule is full. Also it sends a clear message: value time of everyone, and if you can't be bothered to be exactly on time, then your meeting is probably not that important and maybe shouldn't be held at all.
edit: the time to get up and lock the door, then unlock it, and to likely admonish the person who was late - that's also wasted time.