patio sliding door lock

A quick learner from Bloomfield Hills, MI says:
I need to convert the current installed door latch to a lockable one with a key. Current installed one has marking "GLW". The frame is vinyl. If possible I will only want to install a lock barrel to keep cost as low as possible. I intend to do this by myself. Pl suggest a solution.
Patio handle
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Dave Sr. from SWISCO responded:
I'm afraid that your GLW handle is no longer available, and I'm sure what could work with it. It's possible that you could get our 82-310 to work, however I don't know if the outside handle can accommodate it. Check the outside handle to see if it has a cut our knock-out hole to accept something like the 82-310 .
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