The speed, the fact that I can supply the photos via an app so I basically need only a minute with the keys (e.g. when the colleague is on the toilet and leaves the keys on the desk), and the fact that there are no eyewitnesses.

A store clerk might be telling me to wait a bit for the key to duplicate, but in reality call the cops on me; there are cameras in hardware shops which can identify me and the bundle of keys and also there are other customers in the store.