It probably is. We also installed a high-security strike in the jamb. The wood door tolerated six impacts before giving way. The steel door withstood only three hits and allowed entry on the fourth. Controlling the keys Your house will be less vulnerable if you can limit the circumstances under which duplicate house keys can be made.
Locksmiths call that key control.
Unfortunately, the keys from ordinary lock tumblers can easily be duplicated in a local hardware store. We call them out in the Ratings . Medeco high-security cylinders require the pins to be raised to the proper height and rotated for the lock to open. You can also get a key that can be duplicated only at the factory. An electronic home-security system is the single most effective way to deter an intruder.