Security of sliding doors - outside unlocking required

Evening all,

We will shortly be moving to a house where the main entry will be through the rear sliding door. The garage is located at the end of the back yard and accessed from a back lane, so you park your car in the garage and enter through the rear. The sliding door is 90's in vintage, so securiy is ok but not great. I have used patio bolts on sliding doors previously, but this one is a bit odd due to the outside access required.

How do I get a decent lock on a sliding door whcih is able to be unlocked from the outside?

Cheers,

Tom


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