Need to make this sliding door lockable

A quick learner from San Jose says:
Please suggest the hardware I will need to make this sliding door lockable from outside
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Bob from SWISCO responded:

Is that thumb lever on the inside pull perfectly centered between the mounting holes? If so, then you should be able to remove that punchout hole in your outside pull with a punch tool. Then you can use a key lock like our 82-310 . This article here goes into detail about that process. 

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