It will take 3 minutes if they have a proper tool, $500 on ebay and a blank keyfob of $60. Open a door, disable alarm sound, connect the tool to OBD port, program a key, drive.
Aye its effectively a man in the middle attack, I always give a good look around when I park my car and lock her up before headed to work.I've had my car and my wife's Santa Fe entered into with the wireless technology a few times. They were able to simulate the key fob and unlock our doors. Luckily we never left anything in there so it was a waste of their efforts. Been waiting for them to return ever since I had my alarm system installed and bought my personal protection.