I have an old style garden gate / shed lock key that gets me in so many of my customers gardens it's hilarious. Had a customer fit a new lock to their gate just last week. She said 'you won't be able to get in any more unless we're here.' I said 'can I try this key?' It fitted and she was dumbfounded. They've known me for years so weren't too worried that I could get in but we're a bit shocked that their new lock was so easily opened.