code: def keys(self):
          
          if self._keys is None:
              self._keys = KeyList(self._version, account_sid=self._solution['sid'], )
          return self._keys
docs: Access the keys
  
          :returns: twilio.rest.api.v2010.account.key.KeyList
          :rtype: twilio.rest.api.v2010.account.key.KeyList