I keep changing the door knob of my son’s room because he often loses his keys or the keys were inside and the doors were locked. We have to destroy the knob just to open the door. I have also changed once in our bedroom’s door and also in the baby’s room. It is really important that door knobs are durable, efficient and reliable or our security will be at risk. Now, I made sure that I keep all the keys’ duplicates and then I check all doors before we go to bed at night. Next to electric bulbs, door knobs often take a part in our budget for household expenses but it’s alright. It pays to ensure safety at home.