I locked myself out last year after getting home, parked in the garage and pressed the button to close the garage door before walking round to the front door. The problem was that I'd left the chain on that door, so couldn't get in and set my alarm off too I had to get round the back to let myself in but was now locked out of the garage and the gate was locked too, so had to borrow a ladder from my neighbour and jump over the (quite tall) gate. Now I always leave out the front so I can't leave the chain on the door again.