Insert a straightened paper clip into this hole and apply pressure to release the interior handle.
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Remove the faceplates for a stand alone lock cylinder without a door handle via the screws.
There may be a small pinhole holding the handle in place.
Insert the pin straight through the lock cylinder to reach the lock s release mechanism.
Interchangeable lock cylinders are often found in residential and office doors while storefront lock cylinders are typically found in the doors for retail outlets and businesses.
Locate the screws on the cover plate on the interior side of the door.
Lock cylinders can also be found in the ignition in most vehicles.