A technique often used for burglaries is lock snapping. As it is out of sight, the rear doors of the property are usually targeted where unless anti-snap locks are fitted burglars can quietly and easily gain access into your home.
Lock snapping is where they put force on cylinder until it snaps in the centre. They can then get into the mechanism as it is exposed and unlock the door with basic tools. Burglars can snap a lock out of a door in under 10 seconds. Even if your locks are flush fitting with the handles they can still cut the handles off to gain leverage.