Remove the Yoast SEO Post Metabox [closed]

Question

Yoasts SEO plugin adds a metabox to the post edit screen. I'm trying to remove this for users who aren't editors or above.

I've tried putting a remove_meta_box call in on admin_init, trying to remove the action on $wpseo_metabox but to no avail.

How do I remove this metabox without requiring user intervention (the user should never know the metabox existed, so clicking on screen options is not an option )