Spare keys are kept with a trusted neighbor, not under a doormat or planter, on a ledge or in the mailbox. House Keys and car keys are on rings that may be separated. Anyone who handles your keys can easily make duplicates. The door leading from the attached to the house is solid wood or metal-clad and protected with a quality keyed door lock and deadbolt. The overhead garage door has a lock so that we do not rely solely on the automatic door opener to provide security.
Garage doors are all closed and locked when leaving the house.
The sliding glass door has a strong, working lock. A dowel or a pin to secure a glass door has been installed to prevent the door from being shoved aside or lifted off the track. The sliding door is locked every night and each time we leave the house. Every window in the house has a working key lock or is securely pinned. Windows are always locked, or somehow secured, even when they are opened a few inches for ventilation.