// WP_Query arguments
$args = array(
'post_type'              => 'trabajo',
  'posts_per_page'         => '2',
  'paged'                  => ( get_query_var('paged') ) ? get_query_var('paged') : 1,
);

// The Query
$trabajo_query = new WP_Query( $args );
$temp_query = $wp_query;
$wp_query   = NULL;
$wp_query   = $trabajo_query;


// The Loop
if ( have_posts() ) {
    while ( have_posts() ) {
        the_post();
        the_title();
    }
}
wp_reset_postdata();
the_posts_navigation();

$wp_query = NULL;
$wp_query = $temp_query;  // Reset