If you’re a property owner or landlord who needs to disable a lock without having to contact a locksmith, I’d say LockKill would be a fantastic solution to the problem.
With a simple design which covers the two main locking mechanisms on the market, it secures itself into the lock by working with the mechanisms that are our normal pin-and-tumbler locking systems. Once in there, it’s almost impossible to remove without professional tools (or destructive measures) and there’s even a small section cut out of the bow of the key which allows for instant and clean removal of the key head.
Well worth a look - I’m thinking of getting some for those “just in case” security measures.