Hi Jessie, You should be able to use a data partition constraint to do this, and add that constraint to the data partition for those particular roles which you want to enforce this on. You can simply do a view constraint on the status object to block the view of the status for "closed" - this way they cannot see it. As long as you dont have any status transitions in place that prevent going from open to closed, then this should work for you.
Hope this helps,
Jon I.