Trapped in a server room

I work at a big company and we have our own server room. I am a regular office worker and for me, the server room is one of the places, which I do not know anything about. That is just a room, where some complicated machines and computers are situated, but I have never been there and I have never seen how it all exactly looks like. Until this day. A friend of mine decided that we should go there during our break, because the server room was now open. Some technicians were doing repair works down there and that would be our chance to take a look, how a server room looks like. At first I did not want to go, but then I let her convince me and that was a big mistake. We went down to the server room and it so happened, that nobody was near. We tried the door and it was open. We went in and looked at all these computers that were gathered there. It really was not anything worth taking a look, but my friend was very overwhelmed. Suddenly there was a draft and the door of the server room just closed. We were laughing at first and then we tried to open the door, but we could not do it. It was stuck somehow. We were very scared, because we felt a bit claustrophobic and we did not know if anybody would come to the server room. Thankfully a technician forgot something in there and he was very surprised to see us, when he opened the door.