transmutation 

Traditions arcane, occult

Cast [>>] somatic, verbal

Range 30 feet; Targets 1 door, lock, or container

Duration 1 minute

You make the target easier to open. Knock grants a +4 status bonus to any creature that tries to open the target door, lock, or container with an Athletics or a Thievery check. You can attempt a Thievery check to open the target as part of casting knock, and you add your level even if you're untrained.

Knock counteracts lock.

Core Rulebook, page 347.