Vanagons are not easy, I have done it with the classic coat hanger above the
lock knob. The best way would be to use some suction cups and just pull off the
rear side windows. It has always amazed me how easy they come out. Other then
putting the glass back in there is no damage.

The easiest VW to break into has got to be Golf II's. I locked the keys in mine
once and found that by unscrewing one of the license plate lights that the rear
hatch latch mechanism can then be operated.
Sorry to all those Golf II owners.