Where can I find key for the inside doors within my house? My 3 year old keep locking the bathroom door and the builder...

My 3 year old keep locking the bathroom door and the builder only give us one extra keys which is lost. They are the plain straight key with a small flat call a halt. There are no screws on the outside of the lock, so we other end up borrowing a neighbors switch. If anyone knows what type of knob this is, i.e. the name of it, please tolerate me know so that I can get some extra. Thanks!
get a chain coat hanger, cut a short section out of the straight slice, bend a handle on one ruin, hang it subsequent to the bath door, it will work,


A small slotted screwdriver should do the trick.

Bert
Answers:    Go by the hardware store and update them you need a small "Pocket Screwdriver". This is what I use to unlock bedroom/bathroom doors. Work similar to a charm every time!