Hi,

Here if you are looking to automatically create a checkout for those employees who forget to check out, you can create a scheduled action and calls a python function and do it.

But make sure that it will not affect/cause any issue.

You can create a scheduled action by referring to this link:  Automated action in Odoo

Then in the Python function that the action calls,

not_checkout = self.env['hr.attendance'].search([('checkout', '=', False)])
for rec in not_checkout:
    date_time = 'prefered date time here'
    rec.check_out = date_time

If you check the above Python code you can see that attendance which is not checked out yet is fetched and a DateTime is given as checkout time.

In the search, method make sure that the current date's record is only fetched.

Thanks