docs: def rm_token(opts, tok):
      '''
      Remove token from the store.
  
      :param opts: Salt master config options
      :param tok: Token to remove
      :returns: Empty dict if successful. None if failed.
      '''
      redis_client = _redis_client(opts)
      if not redis_client:
          return
      try:
          redis_client.delete(tok)
          return {}
      except Exception as err:
          log.warning('Could not remove token %s: %s', tok, err)