But once Hamazura climbed down from the Power Lifter, he traced his fingers over the surface of the door.

The two-ton piece of heavy machinery entered autonomous standby mode and observed the lock’s structure over the boy’s shoulder.

“So it’s a Method Pin Type 29? They claim it’s theoretically impossible to illegally copy the key, but I should be able to manage with this.”

[...]

Kamijou watched Hamazura work but had no idea what he was doing. However he did it, Hamazura quickly removed the entire lock, pressed on a latch inside, and unlocked the door. The door was made so a grand piano or home theater system could be brought in, so the entire Power Lifter could fit into the entranceway.

Toaru Majutsu no Index New Testament vol.12 ch.3 pt.11