docs: def sign_out(entry, time_out=None, forgot=False):
      """Sign out of an existing entry in the timesheet. If the user
      forgot to sign out, flag the entry.
  
      :param entry: `models.Entry` object. The entry to sign out.
      :param time_out: (optional) `datetime.time` object. Specify the sign out time.
      :param forgot: (optional) If true, user forgot to sign out. Entry will be flagged as forgotten.
      :return: The signed out entry.
      """ # noqa
      if time_out is None:
          time_out = datetime.today().time()
  
      if forgot:
          entry.forgot_sign_out = True
          logger.info(
              '{} forgot to sign out on {}.'.format(entry.user_id, entry.date)
          )
  
      else:
          entry.time_out = time_out
  
      logger.info('{} ({}) signed out.'.format(entry.user_id, entry.user_type))
      return entry