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Sliding Door Hook Lock With Key Sliding doors are elegant and elegant, but they can be difficult to secure. Simple bolts will not suffice, but there are many locks that can be used to secure sliding doors. These mechanical lock systems don't require batteries or electricity and are easy to install. They provide basic PIN access, but do not have the remote features that smart locks offer. Keyed There are a range of keyed locks available to secure sliding doors. They come in different sizes and shapes to suit differ