That's an interesting point: If there isn't any key then there isn't any chance the lock can be bumped. So it stands to reason that you could protect yourself from lock bumping if there aren't any keys in use.
It makes sense in my head but then again I've been working all day. Who knows. lol
Hahahahaha, well that means that time lock can never defeat a determined bumper, if the bumper have been working all day on the lock then there will be definitely a time in the day when the lock suddenly opens up itself and now a new bumping technique appears on the bumping guides of the world known as 'Wait till it opens" lol