Door lock and my sister

Me and my cousin sister, we are almost the same age. During school holidays, she used to be at our home to chit chat with...
Me and my cousin sister, we are almost the same age. During school holidays, she used to be at our home to chit chat with my mom. I remember, one day, I was playing with a padlock, I was trying to open it to see what's inside that keeps it locked and doesn't let anyone open it unless proper key is inserted. I tried inserting my pinky finger in the lock hole and closed it with key. My finger fit properly in it and it felt good. I could feel the latch holding and releasing my finger with each lock...