If you were to take a look at your key chain or key rack, you’d probably notice that you have over ten keys dangling around on them. Pretty much every door in our homes has a key. There's one for the bedroom, one for the guest room, one for the front door, another for the back door, garage, shed and so on. If you've pretty much got the same lock around your home, it can be pretty frustrating having to try all these different keys...
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