Adding exterior lock to sliding glass door

A quick learner from Harlingen, Texas says:
August 7, 2019
My sliding glass door has a latch lock inside but there is no way to lock the door from the outside. I would like to replace the hardware so we can lock and unlock the door from the outside. Unfortunately, I don't see a brand or stamp anywhere in the door frame to identify the model. Do these photos give you any clues for options/solutions?
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Bob from SWISCO responded:
August 12, 2019

Thanks for writing in. Your outside pull looks like our 82-044. This can be fitted with the 82-315 Key Lock & Housing. See the video below for details.
Key Lock And Housing
Key Lock And Housing
82-315
$15.97
How to Install a Key Lock on a Patio Door
How to Install a Key Lock on a Patio Door
VIDEO
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How to maintain a sliding glass door
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