Trapped in A&P

In an effort to get the ball rolling on my whole plan to become anorexic, Marissa and I decided to go to A&P for some healthy food shopping today.
On our way out, we walked up to the automatic door, ready to brave the cold. Well, it didn't move. The door did not open. I can't express enough how dumbfounded I was. We stood borderline shell shocked, planning out our next move for how we'd exit. We both took a few steps back, and approached the door again, hoping that this time, it would sense our presence. Alas, it didn't open. Honestly, I was ready to go to customer service to tell them we were trapped. Then, Marissa had the bright idea to push the door sideways in an effort to manually open it. Ahhh, a sigh of relief -- it opens!
I took at least two minutes of my life after this incident to really punish myself for not thinking of that sooner. I mean, how could we have stood there for five minutes, walking backwards and forwards - only because we are so used to everything happening automatically for us.
I am disgusted with myself.