Reminds me of the time
When I was stood outside my hire car, pressed the unlock button, heard the unlock thunk but found the doors were still locked when I tried to open them.
Spent about 5 mins repeating the lock / unlock sequence, hearing the locks move but still found all the doors locked.
Finally realised that my car was parked a couple of spaces away and I had been trying to get into an identical hire car. This was at a public beach by the way - I would have checked the registration if I'd still been in the hire company car park.