First: turn it off, and leave it off.
Air conditioners tend to freeze up in hot weather when people are moving in and out of a dwelling. Wait an hour or two and turn it back on. If that doesn’t work, contact the management office where you picked up your keys and they will straighten it out.
If you know you will be opening and closing the doors a lot, or leaving a door open for a long time, you might consider turning off the AC portion as a preventative measure.