The Citadel of Chaos

The passageway twists and turns,
eventually ending in a flight of stairs going upwards.
You climb the stairs and find yourself in a short passage ending at a dead end.
As you examine the wall, you discover a short lever, which you pull.
The rock face ahead opens slightly and closes behind you as you walk through.
You are now standing in front of a door, which is locked.

Will you try to break it down ?

or will you cast a Strength Spell to smash it to bits ?