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I think the OP was implying that valets could photograph the house keys, then later go and rob the home of the car owner.

A locked door to a home is rarely a deterrent for a determined thief.

I mean, heck, the valet could just as easily steal the garagedoor codes from a garage door opener, right?

Except, how would the valet know where you live?

He'd get your address from the car's registration documents, which will typically be in the glove box or clipped to one of the visors.

Or he could possibly check the GPS location list for 'Home' or the GPS trace if this data is stored.