docs: def keys(self, id=None, search=None):
          """
          Property-like function to call the _list_keys function in
          order to populate self._keys dict
  
          :returns: A list of Key instances
          """
          if self._keys is None:
              self._keys = {}
              self._list_keys()
  
          if id:
              return [self._keys[key_id] for key_id in self._keys.keys()
                      if id == self._keys[key_id].id]
          elif search:
              return [self._keys[key_id] for key_id in self._keys.keys()
                      if (search in self._keys[key_id].id) or (search in self._keys[key_id].name)]
          else:
              return [self._keys[key_id] for key_id in self._keys.keys()]