I have a problem with a very old bathroom door. The lock is activated from the inside by pressing a button on the side of the nob. There is a hole on the outside of the door in the same position. The button inside the hole was smooth with no groove in it. There are dents around the hole suggesting that the door has been forced in the past. When we tried pressing the button, it would not move. We sprayed some WD40 on the button and still it would not give. Finally we resorted to hammering a screwdriver on the button in an attempt to make it give. Now the button on the inside is heavily dented.
If anyone has any ideas about how this door may be opened or we could possibly break off the knob, please help.