Timed Lock

Lineart by Shoxxe, which can be seen here.

On the run from the authorities, Carla the rogue happens to spot a locker lying deep in a canal… overtook with curiosity, she dives in only to find the darn thing locked.
With the locker too heavy to pull up, she has a few moments to pick the lock before either her breath gives up or the constabulary finds her…