Ceniza's Grateful Arcane Lock

You touch a closed door, window, gate, chest, or other entryway, and it becomes locked for the duration. When a spell of level 1 or more is cast within 5ft of the door, the door unlocks while the caster stays within 20ft. The key used as a focus can wlways be used to open the door.

Otherwise, it is impassable until it is broken or the spell is dispelled or suppressed. Casting knock on the object suppresses arcane lock for 10 minutes.

If the key used as a focus is used to open the door, the spell can be dispelled by the weilder..

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the level of the spell required to open the lock increase to match the spell used.