I’m using an custom theme and I would like to take the id to the values ​​of a reusable block. I have this code:

<?php
$post = get_post();
if ( has_blocks( $post->post_content ) ) {
   $blocks = parse_blocks( get_the_content() ); 
     foreach($blocks as $block) {
        $id= isset($block['attrs']['id']) ? $block['attrs']['id'] : '';
        echo $id;
     }
}

I see the id of all blocks but not reusable blocks. how do I access reusable block data?