display all Custom Product Attributes error

sorry i’m from viet nam and my skill english not well ! i have this code in my site , but it not work , please help me to fix it or give me another solution . I need get all attributes name +value . thanks for readed

function isa_woo_all_pa(){

    global $product;
    $attributes = $product->get_attributes();

    if ( ! $attributes ) {
        return;
    }

    $out = '';

    foreach ( $attributes as $attribute ) {

        $out .= $attribute['name'] . ': ';
        $out .= $attribute['value'] . '<br />';

    }

        echo $out;

}

add_action('woocommerce_single_product_summary', 'isa_woo_all_pa');