The studio door that was never really an external door
A garage becomes a studio. The builder hangs whatever door was to hand — often a light internal door in a thin frame — fits a basic handle set, and the job is signed off. Years later it is somebody's only entrance, facing a driveway, out of sight of the street.
Nothing about that door is a lock problem, which is why nobody calls about it until something happens. The honest fix is a solid external door leaf in a properly fixed frame, then a deadbolt and hinge bolts. Where the budget will not stretch that far in one go, we say which single change buys the most and why.