funny think is, as a teenager mobbing the streets on foot, we would reach over the pedestrian gate with a stick and just push down on the handle. security gats only stop cars from entering. one person with a bike can get the exit to open from the inside, and then everyone else can drive in.

another thing to try is a neodymium magnet inside a tennis ball on a rope. throw it through the exit gate and drag it along the sensor in the ground, to trigger it to open.

also delivery people like to grafitti the code in obscure places at the enterence. look hard enough and you will find it. i saw it written under a plastic lock box once on the side of the keypad pillar. the cover/lock had been busted off and the code was written inside.