Right, most of the time you would meet the technician and unlock your car or hand them the keys until they are done. They don't just walk up to a locked car and replace the glass. I am sure on some care with out and alarm sensor on the windshield they would almost be able to replace the glass without the keys. I am sure that's a rarity though.

I have a friend that works in the industry. I'll bring this up to him and see what he says.