How to lock an inside door with round doorknobs turning both

I'd like to lock an inside building door, which I'm pretty sure is possible. The lock/doorknobs look like the pictures. The doorknobs can turn both clockwise and counterclockwise. How do I lock

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How To Fix A Stuck Door Knob: A Simple Step-by-Step Guide

How to Install a Door Knob: 13 Steps (with Pictures) - wikiHow

PERFECT FOR PRIVACY with one-directional locking function and improved finish, these are ideal for bedroom and bathroom applications. To unlock,

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