Old Vivitar Lens?

I am after a macro lens, came across an old Vivitar one which fits my new Pentax K100D, focuses beautifully etc etc, but one major problem, I can’t push down the shutter!! Am I missing something here or are they just not compatible?? Also had the same problem with my old lenses from my original Pentax K1000.

A friend of mine has a new Pentax 20D and is using her old lenses with it, can’t for the life of me remember how she got them to work.

Any help or advice would be greatly appreciated!
Cheers Tina :-))

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