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Rifle Scopes Swfa 10 rear focus knob wont turn

I have owned a ton of the SWFA fixed power scopes. Never had that happen. They are fairly parallax and focus sensitive when going from close range to long distance. If you are shooting at a distance that the parallax is not set for it can and likely will cause error in your point of aim. I would not be able to deal with it being locked up. Call SWFA and see if they'll exchange it.
 
Is it mounted when you have this problem?

How close to the rear of the scope is the back ring? If it is too close to the adjustment knob, it will clamp the barrel that's inside the scope which adjusts the parallax.

If unsure, remove the top of the rear ring and try it again. If still unsure, take it out of the rear ring entirely and test it.

If it still does not move, send it back for repairs.

Ask me how I know....