They may give a false sense of security. They are easily kicked or pried loose. If the double cylinder deadbolt is locked when the house is occupied, a key should be left in the the inside keyhole as a means of fast exit incase of fire. Always remove the key when leaving home. Any open space between trimmers and wood door jambs should be solid-shimmed by a piece of wood extending 6 inches above and below the strike plate.
Garages Always keep garage doors closed and locked.
Intruders may seek entrance through the garage, burglarize the garage or even use tools stored in your garage to break into your home. Keep tools in a locked location. The single lock on the garage door is not enough to keep intruders from prying up the opposite side and crawling in. These must be of hardened steel and installed with carriage bolts through the door or gate. Use large washers on the inside.