Can I still use my physical key even after attaching the NinjaLock? カスタマーセンター September 21, 2017 09:45 Updated Follow Yes you can still use your physical key. You may also turn the thumb turn from the inside by hand. Related articles Can I return the NinjaLock in case I can't attach it onto my door? Do you offer an installation service? How is the security level? Comments 0 comments Please sign in to leave a comment.