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<?php
/*Custom sort cateogry id 5 archive */
function isg_custom_property_archive( $query ) {
// only modify queries for category 5 if it exists
if ( !is_admin() && term_exists(5,'category') && $query->is_category(5)) {
      $query->set('posts_per_page','-1');
      $query->set('offset','0');
	    $query->set('orderby', 'meta_value_num');
	    $query->set('meta_key', 'price');
	    $query->set('order', 'DESC');
    }
}
add_filter( 'pre_get_posts', 'isg_custom_property_archive' );