Always, even though my wife thinks I am paranoid. She has no trouble with locking up at night, but during the day the door that connects our garage to our house is unlocked if she is home alone. If I am home, or when I leave through the garage, I will lock the steel door on my way out. Our front door stays locked, and the sliding glass doors stay locked because to leave them unlocked also means that they are not always fully closed and sealed to keep in or out the outside air. My garage door is never left unlocked unless I am in the garage or in the front yard. And while I did not do so in the past, I stay armed while at home about 90% of the time. I am sitting right now at my PC in my bedroom, still in my pajamas, and not armed. But I am within a few feet of an easily opened GunVault with loaded firearms waiting until needed.