I'm Coming In.

One weekend I was watching a few movies. At least two of these movies had a scene where someone punches through a glass panel and reaches in to open a door. Having a glass panel within reach of a lock is foolish, but it is commonly done. Your own door may be of this sort.
Chris from UKBumpkeys has passed on an excellent video on ways to bypass locks without lock picking. It is quite long, but well worth a watch.