What they didn't take into account was the number of people that go in and out of the building every single day. Imagine a 12 story building with at least a hundred people on each floor on the average day. And they had to be funnelled through a single turnstile. Then there is the elevators.
One morning, everything was activated at once. The line backed all the way outside the building and wrapped around. You could spend up to twenty minutes to get into the building. Then once you are in, you have to wait for the elevators. You have to scan your keycard to get to your floor. Now try doing that with 30 people in the elevator and they all want to go to a different floor.
"Can you press 11 for me?"
They couldn't, because their card only works for the third floor.
In less than a week they shut everything down and went back to the designing board. They had to rebuild the reception to add 4 turnstile. The elevators keycard readers were never reactivated again.
I started taking stairs and never looked back.