Do you have to? Really?

While I was working today, I had a discussion with my co-worker about something that happened on a job. We were fixing a piece on a commercial door, a double door, that involved standing in the opening after taking one door off. While working, people kept going through the door, but not the door that was next to us, but the door we were working on. It wasn't just today and it has happened other times. The question we debated was why do people insist on going through the door we are working on instead of the door that is operational? It always happens this way. We end up having to move to let people through multiple times in a job.
Are we as people really that lazy that we will make someone stop working and move for us just so that we don't have to open a door on our own? Really people? I mean, I am all for not opening another door if there is one already open, I wouldn't make someone stop doing the job to let me through. I will open the other door.
A thought we came up with is people may wonder if the other door is functional and they don't want to break things, but as a worker, I would let people know if a door was out of service so they wouldn't break it by going through it.
My point is don't be lazy and let people work. We need to be courteous to all people. If there is a legitimate reason for coming through the door, by all means come through. That is all.