This is an interesting thread, I googled around a bit to see what could block or mask a key fob from working.
Car thieves are using jammers happily supplied by china, to jam key fobs. You pull your car into the gas station and run in to get something, pushing the button to lock the door. If the jammer is on the door does not lock. They turn the jammer off, get in your car and take your stuff.
With some cars if you are still close enough the car will start up, and they drive off with your car.
So back to the case in point, its possible someone had one of these key fob jammers at the bike shop, hoping to get into someones car that had been prevented from engaging the door lock, or had some other plan in mind.
Personally Ive never liked key fobs or car security systems. I would rather lock the door by pushing the button as I get out, and open it with a key, than to set an alarm that disables the engine. If the $3 battery in the fob goes dead, or you drop it in a puddle, now your perfectly fine vehicle will not start and you are stranded, because the weakest link failed.
I tell people I dont think its necessary to disturb the electromagnetic ionosphere and beam radio energy out into the universe, just to open my car door.
Everything should be as simple as possible.