how to auto close topics in bbPress forum after some days?

I am new to wordpress and I'm trying to make a forum which has an announcement forum in which users can discuss new updates and news but I want the topics in that specific forum to be open for a limited time (3 days for example) and then close automatically.

I tried searching but I can't find a clear answer. There is no option for this either in the forum settings.

If I have to edit code, please explain step by step as I have never worked with php either.

thanks