The doors in the building where I stay while in Delhi use old-fashioned keys that have all but disappeared from our lives, except maybe as a plot twist in Scooby Doo.
So, what happens when such a key is lost and needs to be replaced? What happens is, a locksmith makes a house call and files a new key, by hand, while sitting on your floor, as pictured here.
The locksmith came and filed and filed and filed little notches in the key, then tested the key in the door. Then he filed more, and tested more, and filed and tested and filed and tested, until the key worked properly.
The bill came to six dollars.