What is not a physical security measure for your home? (antiterrorism scenario training, page 2)

One thing that is NOT  physical security measure for your home is : Hiding a key outside to ensure family member can get in if they lose their keys

These kind of behavior will compromise your home's security. It will be easy for a criminals to get in if somehow they manage to acquire the information about the location of your outside keys

You should take your friend with you