 FACT: The key to the BMW is that of a BMW car. It has the standard  Trunk/Lock/Unlock buttons on the key. A BMW motorcycle key is quite  a bit smaller with only a silver metal case at the top of the key.  Further as Jennings runs around the car lot he is pushing the BMW  logo in the middle of the key, this is the Lock part of the key  which would not reveal the vehicle he was seeking anyway. The action  of the lock part of the key on already locked BMW 3 series is to  turn the interior light on. Not visible in daylight.