def get_key(self, store_name: str, key: str) -> Optional[KeyDocument]:
        """Get a key from a store.

        Args:
            store_name (str): the name of the store to get the key from
            key (str): the key to get

        Returns:
            Optional[KeyDocument]: the key document, or None if the key does not exist
        """
Get a key from a store.

        Args:
            store_name (str): the name of the store to get the key from
            key (str): the key to get

        Returns:
            Optional[KeyDocument]: the key document, or None if the key does not exist
        
fiftyone/factory/repos/execution_store.py