As soon as you finish laughing, an emergency.
My son is 450 miles away, tried to change the battery himself (OK so far). He took out the old one in an AUtoZone parking lot, and thoughtfully closed the trunk while going back into the store to get the new one, and now he can't open anything.
If you have the solution, quick call me?
Nevermind! OK, false alarm. He called back saying the mechanical key does in fact work. It was just being finicky for a bit, never having been needed till today.