There are a couple of other methods of getting into cars electronically that have been found in the wild. One is to jam the remote keyfob, which is simpler than capturing and duplicating key codes. People press the button, but cars don't lock. This has been done in car parks and the like, so thieves can rifle through several cars at once. Many people obviously walk away from their cars, use the keyfob lock and don't bother to check if it locks.
The other method that is used with cars on the drive and proximity keys, is to simply use a signal booster so the car thinks the key is in range, when it's inside the house. In fact, if you keep your proximity keys near your front door, and your car is close by on the drive, the car may well be open to anyone who tries the door as the car will see the key as being within range.