I have a bedroom door that is unlocked with a coin how can I stop

This video goes over the inside of a door handle that you would use in your house Lock 04

Photo about Simple latch slot door lock Image of door, latch, iron

door mail slot Stainless Steel Door Mail Slot with Extra Large Mail Catcher and Combination Lock - 11'' x '' Mail Slot Cover and Extra Large Mail Slot Catcher

door lock slot KALE DOOR LOCK HALF TYPE CYLINDER WITH THUMB TURNWITHOUT KEY 164-RM Kalekilit Door Lock Body: MS 58 Brass Polished Standard profile (