No home is burglar proof, but any home can be made difficult to enter.
Keyed locks are available to add to most existing aluminum sliding doors and windows. They can be fitted into existing locks and prevent opening without a key.
Deadbolts cannot be forced with a credit card. We recommend 1.5 inches throw (how far it goes into the door frame). This makes it harder to force the door open. Remember, a deadbolt keyed on both sides is doubly difficult. The burglar might get in a window but needs to get the loot out the door. For safety, leave a key near the door when you are home.
Harden doors by fastening the striker plate with three-inch screws passing into the stud wall. Replace one screw on each hinge with a protruding nail and leave the opposite screw out. If the hinge is pulled, the door still cannot be removed.
Anti-jimmy bars, as simple as a piece of wood, can be laid in sliding window tracks to prevent their opening. More sophisticated bars can be locked into place.