@nikhitha24 I would say instead of writing script, create flow designer on HR task table.
I have created below flow and its working
I have attached xml of the flow here. You can load it in your instance and use it
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@nikhitha24 OOB configuration available on HR Service to close case automatically. There is a checkbox called as "Automatically close case" on HR service configuration record. This checkbox is visible when "Fulfillment type" is Service Activity or Lifecycle event.
When you check this checkbox then it will show one more field called as "Close when". It will have two options
1) All to-dos are complete
2) Mandatory to-dos are complete
If you select "All to-dos are complete" then HR case will get closed when all tasks gets closed.
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