Sort query by multiple keys

Wordpress: sort query by multiple keys

function update_archive( $query ) {
	
	$query->set('meta_query' , array(
		'day_clause' => array( 'key' => 'event__day' ),		
		'time_clause' => array( 'key' => 'event__start_time' )));

	$query->set('orderby' , array( 'day_clause' => 'ASC', 'time_clause' => 'ASC' ));
}

add_action( 'pre_get_posts', 'update_archive' );