True story about my first day at my old job (please note that I had, in fact, had 2 interviews at that office, so I had been there before): I was really early, so I went to the McDonald's across the street for coffee, and then headed up to the office, where I pulled on the door handle...and it didn't open. Big glass door, which showed no signs of life (at that exact moment) inside. So I just kind of stood around in the hallway, waiting for someone to show up with a key and open the door.
A couple of minutes later, one of my new co-workers walked up, gave me the stinkeye for skulking about in the hallway (he had no idea I was the new employee), walked past me, and...PUSHED the door open.
I seriously didn't even try pushing the door open when pulling didn't work. I had been there before, TWICE, and presumably the door worked on both occasions. My only feeble defense is that it was my first day and I was nervous.
My only other defense is: Midvale School for the Gifted.