Conjuration (Creation) [Cold]
Level: Sorcerer 1, Wizard 1
Components: V, S
Casting Time: 1 standard action
Range: Touch
Target: Lock touched
Duration: 10 minutes/level; see text
Saving Throw: None
Spell Resistance: No
You jam a locking mechanism with ice, raising its Open Lock DC by 10 and the lock’s hardness by 5. Fire attacks against the lock deal double damage. In cold or lower temperature bands, this spell lasts 1 hour per level.
Source: Frostburn, page 97.