Arcane Lock

From The Domains of Dread
School: abjuration
Circle: arcane 2nd
Spell Components: V, S
Action Time: 1 action
Range: medium
Shape: broadcast
Targeting: unlocked ground container, door or held device
Base Duration: long
Saving Throw: no
Spell Resistance: no
Ritual Components: any keyhole mechanism

Causes an ephemeral lock of force to appear on target door, chest or held device, whose Handle Device DC becomes equal to 5 + caster level. This is a noticeable effect even if the caster is hidden. If arcane lock is cast on a target which is already locked, the spell loudly fails as the mechanisms are still manipulated but unmoved.