Through the Heroku PostgreSQL add-on create a new backup capture you can do that by the UI or the CLI running:

heroku pg:backups:capture -a your-production-name-app

After that download the backup on your local machine, and set it in your local environment running on the terminal:

pg_restore --verbose --clean --no-acl --no-owner -h localhost -d <data-base-name> /Users/juanequex/backups/<your-local-backup>

and it is what it is, enjoy your local debugging.