The way to find out if the child lock is on, is to pull the black plastic inside door opener, with the door open, and if it moves freely, the lock is off.
For the record, if the little metal lever is down, the child lock is off. It is a very small L shaped lever which goes over the white plastic part of the door lock mechanism which engages with the metal hoop.
So down = off, up = on, or upon !