Please help LH or RH ?

A quick learner from New York says:
Hi, Please can you tell me if my door is RH or LH.
I'm confuse reading all about.Need to purchase lock either 82-316 or 82-317.Thanks
User submitted a photo of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Andersen determines the handing by viewing the door from the outside of the house looking in. With that in mind, I would suggest our 82-316 left hand key lock. My reasoning is that when you are on the outside of your house, you would use your Left hand to slide the door open.
A quick learner says:
Thank you
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