How do I disable a locking door latch?
Glue could fail and/or look ugly. Other options cost money. When you remove the inside knob, you will see a connecting rod protruding from the latch mechanism that engages the lock button. Cut this off so it no longer engages the lock button. Do not cut the semi circular shaft that engages the main lever! Ensure the remaining stub is turned to the unlock position and reassemble the knob. The lock button will now turn freely, but it's impossible to lock the knob without a key or disassembling the knob.