Defeated by a lock

Sam: Do we have some gloves?

Me: Yes, there’s some in the back of the car.

Sam: So shall I go and get them?

Me: Yes, that would be fine.

…

Sam: Where are the keys?

Me: In the window by the door, same as always.

…

Sam: Why is the front door locked?

Me: I guess Mum thought we were done for the day, so locked it.

…

Sam: I think I’ll just go round the back.