get page id’s – not get pages?

Use the parameter 'fields':

$pages = get_posts(
    array(
        'post_type'  => 'page',
        'meta_key'   => '_wp_page_template',
        'meta_value' => 'product.php',
        'fields'     => 'ids'
    )
);

Not tested, but it should fetch just the IDs.

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