Have you ever found yourself standing outside your front door, patting down every pocket, only to realise your keys are sitting on the kitchen bench? Or maybe you've moved into a new place and wondered who else might have a copy of those old keys? Perhaps you've noticed your lock getting stiff and temperamental, making you question whether it's about to give up entirely? These scenarios are more common than you'd think, and they all point to one simple question: when exactly
