With the exception of sliding doors, all exterior doors should have a deadbolt lock in addition to the lock built into the doorknob. The deadbolt should be high quality (grade 1 or 2, solid metal with no exposed screws on the exterior), with a throw bolt (the bolt that comes out of the door) at least 1 inch (2.5 cm) long. The lock should be properly installed. Many homes have lower quality deadbolts or throw bolts less than 1 inch (2.5 cm). These must be replaced. Adding an additional lock will provide extra security when you are home.  The dead-lock (sometimes called an 'exit-only deadbolt') is a deadbolt that does not have an external key.  It may be clearly visible on the door from the outside, but it cannot be broken into without destroying the door, frame, or lock itself.  While this security won't help directly when you aren't home, its visibility may discourage an intruder from trying the door. The best way to secure sliding doors is to install keyed locks at the top and bottom. You can also make or purchase a bar that swings down from the door frame to the middle of the door to prevent the door from sliding. At the very least, place a rod (a thick wooden dowel, for example) in the bottom track of the door to keep it from being opened. Regardless of the method you use, it's a good idea to reinforce the glass with polycarbonate panels, as recommended in the previous step.
قم بتركيب الأقفال ذات اللسان. قم بتركيب قفلٍ بمفتاح. أحكم إغلاق الأبواب الجرارة.