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Hi pamspix,
When you say it doesn't open - do you mean the lid in front of the lens?
It can happen that the grease becomes resinous if it is not used for a longer period of time or that some dirt has settled between the slats.
You can try to move the slats very carefully and see if this solves the problem.
If this is not the case, unfortunately the only thing left to do is to repair the slats.
Cheers
Peter