Eh, it goes several ways.
We have a passcode system at work and have been robbed (food, blankets, etc.homeless community, not violent offenders so far) several times because the keys get dirty/smudged/faded and anyone smart enough to notice it only has to make a couple trys of sequential ordering.
Unless you can get all 100+ parents to agree to learning a new code weekly AND make immature adults not tell their kids the code so they don't have to get out of the car
; you are open for people with too much time on their hands figuring it out.
At night, on weekends (even with a security system) it is free food and sleeping quarters, you know?
Not to mention teens playing pranks on their old stomping grounds...
Ironic the ice creams and deserts always go first...
