It's convenient right now. There won't be any signs the lock was picked, which York can also do but this is faster and easier. He nods at Shelley.

"Keep watch out here, tap me on the shoulder if I have to come out sooner."

And then he's leaning forward, his head passing through the wall rather than bumping against it. He angles it so only his forehead and eyes (and a little bit of nose) are poking through -- hopefully not enough to draw the attention of anyone who might be inside, especially this low to the ground.