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You can block them with workflow properties.
but in this case, find the status that is "closed" (one or many), edit the workflow and add
jira.issue.editable = false to those status (you might want to do the same for comments and other permissions)
On that page, there's mention of how you can do the same for comments.
That would be through the jira.permission.* property.
Without duplicating all the information here there is an elaborate article about this on:
The one you are looking for I believe would be:
jira.permission.comment.denied = denied
It's a bit older information (2011) but the information should mostly be accurate.
If they no longer work let me know and I'll do some testing myself :)