Go to a bin next to a wall blocking you from freedom. Climb in the bin while facing that wall and turn to face it in the bin. Then get out. It may take a few tries but eventually you will be able to walk through the wall and escape!
However, enjoy your breif glance. If jimmy is to be knocked out or pass out, the game will reset and you will have to do this again to escape.
You can not go in shops or buildings, but you may ride bikes. Pretty usless, but cool.