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 the door without the key?
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The lock/doorknobs look like the pictures.
Does that mean the knob in the photo is not the actual door knob you have ?
I am not sure about you door knob but on some older door knobs you push and turn to lock. It may be that it is only lockable with a key.
Grasp the door knob that does not have the key slot in it, push the knob in and then while holding it in turn it, probably clockwise, just little and it should stay in when you release it and that should lock it.
You can do this with door open so you can test the other side to be sure it is locked.
It's a matter of time before that knob mysteriously locks on you. No one will know why, and no one will be able to get back in.
In its unlocked state, it can typically be removed. You unbend a large paper clip and jam it down the hole you can see (on the non-locking side; that releases the knob. Then you measure your spacing (center of big hole to door edge) - either 2-3/8" or 2-3/4". Go to the hardware store and get a knob set that you like.
Unless you are sharing the house with strangers, most such doors are privacy knobs that only lock from the inside. They have a hole in the end of the doorknob that you stick a paperclip into in order to override the internal lock.