My door has button that lock knob when close door. Locksmith

1939 interior door lock - help needed : r/Locksmith

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𝐖𝐞 𝐬𝐨𝐥𝐯𝐞 𝐩𝐚𝐢𝐧 𝐩𝐨𝐢𝐧𝐭 𝟏: After you leave the store, you don't have to worry about returning to lock up. Your employees can lock the door with a simple

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Front door locks automatically when closed. : r/Locksmith

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Came home to find this device attached to my front door covering the key lock. What is it and what should I do? Is it safe to open? Who would have installed

My door has button that lock knob when close door. Locksmith showed me to unlock. Thought turned key all way to left-held-pushed door but not working? - Quora

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