Hiding a "Post" page box (meta box?)

Hello,

I’m using a theme that adds several options to the Post pages (where you add a new or edit a post – I believe these are post-new.php and post.php). Because I run a multi author site, I don’t want all my users to have access to these options, but I want to retain them as admin.

I’m trying to follow the Codex to hide this section from all users, except admin, but I can’t get it to work.

I looked at the page elements and it appears that the div ID for that section is “post_options”.

So, in functions.php, I tried the following (and some variations):

if (is_admin()) :
function my_remove_meta_boxes() {
 if( !current_user_can('manage_options') ) {
  remove_meta_box('post_options', 'post', 'normal');
 }
}
add_action( 'admin_menu', 'my_remove_meta_boxes' );
endif;

But that just breaks the site. Perhaps what I’m trying to move isn’t a meta box? Any help would be appreciated, I’m a newish user and don’t have much experience with actual code. Thanks!