Spells (3e)

An arcane lock spell cast upon a door, chest, or portal magically locks it. The character can freely pass the character's own lock without affecting it; otherwise, a door or object secured with arcane lock can be opened only by breaking in or by a successful dispel magic or knock spell. Add +10 to the normal DC to break open a door or portal affected by this spell. Note that a knock spell does not remove an arcane lock. It only suppresses it for 10 minutes.