Locked indoors

Luck seems to be against me right now. This morning I was leaving the flat; I arrived at the bottom of the stairs to go out the door only to find it had somehow jammed itself shut! I kicked, pulled and rattled it for a good while but it wouldn't budge. So I had to leave via the garden; involving climbing through somebody else garden which I doubt they were happy about but hey- had to be done. It is now 19 days until moving out day and I still haven't got a new place sorted- maybe now is the time to start stressing...