The door to the bathroom in my house was accidentally locked and I can't figure out how to unlock it from the outside.
The knob has 3 holes on the outside:
The hole in which on a normal doorknob you would insert a key, screwdriver, etc. and turn to unlock. On this particular knob in the hole, there is a silver, metal, cone-shaped plate that can be pushed in (but not rotated - there is no kind of groove to place a key in and turn). When you push it in, it goes about an inch in and you can feel a spring pushing back but it doesn't seem to change anything.
A small circular hole on the cylindrical portion of the knob that connects to the door. It isn't on the base that actually touches the door, but on the cylinder connecting the spherical knob and the base. You can see the metal turning through it as you turn the knob, but there isn't a full hole to the inside of the knob.
A rectangular hole on the same portion as the small circular hole in #2. It looks like there is some kind of metal tab that should be able to be moved, but applying force in any direction has not had any results.
I've tried every combination of push, pull, twist, push in hole #1, #2 and #3 I can think of with no luck. Does anyone know what kind of knob I'm talking about and how to unlock it?
Here are pictures of the knob: http://imgur.com/a/io4F4