Nepalese Padlock & Keys

Stuck at home waiting for someone to come and quote for a roof repair. This old curiosity has been hanging around by my computer for years. To open it the end of a key has to be inserted in that T shaped hole and then pushed lengthwise into the body, this allows the tail to be pulled free.
It's about 2cm long, so just about qualifies as tiny.
Thanks to Freyjad for the March TT challenges.