That's a good start. You also need bake in the fact that 20% of the people will ignore this system and attempt to exit out of order because they're in a rush /

That's a good start. You also need bake in the fact that 20% of the people will ignore this system and attempt to exit out of order because they're in a rush / they are "important" / they don't give a flip, which will then have a domino effect.