Instructions
Create a "Cannibalistic Large Steel Door" and place it next to the locked door. The created door will come alive and eat the locked door. The Cannibalistic Large Steel Door can be opened normally.
Generate a "Shelter," then place it so it clips through the locked door. When walking through the shelter, the player can pass through solid or locked objects. Just make sure the shelter is placed halfway through the door.
Summon a "Tiny Ultrasonic Rideable Flying (creature or object)." Mount this creature or object and your character will shrink. Navigate this mount through the keyhole to pass through the locked door.