Certain containers are fitted with [[Containers#Trap types|traps]], designed to keep potential thieves from messing with the container. They are designed to activate if damage is done to the container frame or to the lock itself, in order to prevent brute forcing, but it is also possible to trigger them while lockpicking.
If a character attempts picking the lock on a trapped container, regardless of the type of lock, an incorrect guess '''will has a 10% chance to cause the trap to fire''' as if the container or the lock had been damaged. Trap accuracy applies as it normally would.
Successfully picking the lock on a trapped container ''does not'' disable the trap, but merely renders it temporarily safe while your character loots its contents.