Wizard Lock

This spell magically holds shut a door, gate, window, or shutter of wood, metal, or stone. The magic affects the portal just as if it were securely closed and normally locked. The effect lasts indefinitely. Knock can be used to open the doorway without ending the spell, and dispel magic can be used to end it permanently. The caster of this spell can easily open the door or other portal without ending the spell, as can a Magic-User three or more levels higher than the caster.