rwmb_my_custom_field_after_save_field can't update my own fields in the database

Hello,

I'm using metabox type user with the custom table users.

I want to use this action:

add_action( 'rwmb_my_custom_field_A_after_save_field', 'usuario_aprobado_con_codigo_acceso' , 20, 5 );
function usuario_aprobado_con_codigo_acceso ( $null, $field, $new, $old, $post_id ) {

Depending of the field my_custom_field_A (the value is in $new), I want to update another custom field of the custom table users, my_custom_field_B

I see in another posts
https://metabox.io/support/topic/using-custom-attributes-from-rwmb_before_save_post-action/
something like this:

$storage = $field['storage'];
$storage->update( $post_id, 'last_name', "blablabla" );

And it run well, it update the filed last_name. It run well with the populate user fields.

But if I want to update another custom fields that I added in this table, I don't know what I have to do to update the value...
I try:

$storage->update( $post_id, 'my_custom_field_B', "blablabla" );

don't work...
I try a query:

    global $wpdb;
    $wpdb->update('usuarios', array( 'my_custom_field_B' => 'blablabla'), array( 'ID' => $post_id ) ); 

and don't work...

Do you know what I'm doing wrong?

Thanks,
Sergio