The main door key has taught me few great lessons and it never forgets to remind me in case I missed to remember. First one is: be kind and the second is: do not rush.
Whenever I rush to lock the door, seems I become unkind to pull out the key from the lock and it get stuck each time. I slow down and pull the key gently and it comes out. I smile and take the lesson in my head before I start my day.
The biggest lesson it taught me is: the lock will open only with the right key, learn to recognise the right one out of many.