Change Post Sort Order by Meta Key in WordPress

post-sort-order-by-meta.php

//	change sort order of posts based on meta

function change_order_for_post_archive( $query ) {
    //only show future events and events in the last 24hours

    if ( $query->is_main_query() && is_post_type_archive('attorney') ) {
        $query->set( 'meta_key', 'ecpt_position' );
        $query->set( 'orderby', 'meta_value' );
        $query->set( 'order', 'ASC' );
    }

}

add_action( 'pre_get_posts', 'change_order_for_post_archive' );