If you call someone to open the door for you, they wedge a piece of plastic in the door jam in the upper corner (furthest from the hinges) and then use something long or hooked to hit the button or pull up on the lock. I highly doubt the coat hanger trick will work. You have to be careful since you will be bending the glass in the window, but you could be able to pry the door open at the top corner wide enough to get something in there.