It's to unlock a keyless interior door knob. If somebody accidently locks a door you place this "key" into the small hole of the door knob and feel for the slotted hole inside the knob. Turn it and it will unlock the door.
We've always kept these "keys" around..........kids and now grandkids are locking the doors and shutting them. Saves on breaking the door jam.
Hope this helps.
__________________ Dave & Patty
2012 Infinity 3850RL 2011 Ford F-350 FX4 6.7 Diesel
Lloyd our bathroom doesn't gave that. We had to disassemble the entire door knob when DD locked the bathroom door and shut it with nobody in there... not fun at 9pm when you just got backed in and are trying to unpack and get the little one to bed.