Loosen the set screw on one door knob and twist or pull it off the spindle, then pull the other knob and the attached spindle out of the hub. Cut through the paint around the faceplate and remove the screws, as shown. Stick the screwdriver through the spindle hub and pop the lock out of the door.
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Bench grinder (optional)
1. Penetrating lubricant, such as WD-40