How to set a template with wp_insert_post

You can check this code I am able to work with this

function cutom_function() {

    $new_page_id = wp_insert_post( array(
        'post_title'     => 'PKB',
        'post_type'      => 'page',
        'post_name'      => 'pkb',
        'comment_status' => 'closed',
        'ping_status'    => 'closed',
        'post_content'   => '',
        'post_status'    => 'publish',
        'post_author'    => get_user_by( 'id', 1 )->user_id,
        'menu_order'     => 0,
        // Assign page template
        'page_template'  => 'pratik.php'
    ) );