Killer Key for Instant & Permanent Locks Disable

The killer key is a practical novelty tool that allows instant and permanent disable of a lock. All to do is to insert the key into the lock; once done, it cannot be undone; the key cannot be removed. The purpose is to lock the door from the outside, so those having the key cannot enter, but it can be opened from the inside, meaning it is not meant to lock someone inside. So, if you have a dear one having property management issues with evicted tenants, for example, the killer key will present them a temporary solution until changing the lock.