What game is this die from?
Could it be one of
Rory's Story Cubes
?


After looking closely at those photos, I'm going to say definitively, why yes. Yes it could:

In the top photo, the front right die has an [L] and a fire facing the camera.
In the bottom photo, the die in the top right of the box art depicts a single die with a magnet, sheep, and footprint on three sides.

SQB points out in comments these are in fact the same die, with a lock on the side these photos don't show, so it matches the description of the die you found precisely.