A sternly-written, notarized letter of indemnification? A bizarro-world sequence of events (like activating Developer Mode on Android)? A game of Galaga which, if played perfectly, unlocks the gate just as doing so unlocks the black car in Ridge Racer on the PSX?

I don't know. It's a gate that allows a person to leave the garden. It exists to be opened, and to be passed through, and also to be closed again -- or to be left open. :)

(The UAC prompt in Windows is also a gate, if existing work is to be studied.)