Arcane Lock

Abjuration (Ward)
Tier: 2
Components: Verbal, Somatic, Material
Casting Time: 1 major action
Ritual Casting Time: 10 minutes
Range: Touch
Target: The door, chest, or portal touched, up to 30 sq. ft./level in size
Duration: Permanent
Saving Throw: None
The mark burns upon the chest, and then fades. You do not bother with the old brass lock.

An arcane lock spell cast upon a door, chest, or portal magically locks it. You can freely pass your own arcane lock with a touch; otherwise, a door or object secured with this spell can be opened only by breaking in or with a successful dispel magic or knock spell. Add 10 to the normal DC to break open a door or portal affected by this spell. (A knock spell does not remove an arcane lock; it only suppresses the effect for 10 minutes.)

Material Component
Gold dust worth 2 gp, used in markings upon the door. Ordinary chalk can be substituted, but the spell lasts for only 1 minute per caster level.