How to use the hickle.helpers.sort_keys function in hickle

#either a file, group, or dataset
    if isinstance(h_group, (H5FileWrapper, group_dtype)):

        py_subcontainer = PyContainer()
        try:
            py_subcontainer.container_type = bytes(h_group.attrs['type'][0])
        except KeyError:
            raise
            #py_subcontainer.container_type = ''
        py_subcontainer.name = h_group.name

        if py_subcontainer.container_type == b'dict_item':
            py_subcontainer.key_type = h_group.attrs['key_type']

        if py_subcontainer.container_type not in types_not_to_sort:
            h_keys = sort_keys(h_group.keys())
        else:
            h_keys = h_group.keys()

        for h_name in h_keys:
            h_node = h_group[h_name]
            py_subcontainer = _load(py_subcontainer, h_node)

        sub_data = py_subcontainer.convert()
        py_container.append(sub_data)

    else:
        # must be a dataset
        subdata = load_dataset(h_group)
        py_container.append(subdata)

    return py_container