How to make a hinge stay in its current rotation, resisting force ?

Hi, i recently starting using unity.
(first ever post also)
For my current project, I'm using a hinge joint working as some sort of muscle.
There are curently 3 modes : contracting, extending, and relaxed.
I want to set another one where the hinge holds its current rotation and resists up to a certain threshold of force applied to it. When more force is applied, it should have some give and rotate, then stay as is when you stop applying force.
Here's a paint drawing of what I mean if I'm not clear enough : I don't know how to make this work.
I've tried setting the min and max rotations to it's current one at the time but that's obviously a stupid solution and however I set it, it would either go back to said position or instantly go to 0°, but i had no other idea.
Any input on how to code this will be appreciated ty