Redirect not logged in users if they are on a specific page

Your function is fine, but 'get_header' it’s too late.

Use template_redirect instead:

add_action( 'template_redirect', function() {

  if ( is_user_logged_in() || ! is_page() ) return;

  $restricted = array( 250, 253 ); // all your restricted pages

  if ( in_array( get_queried_object_id(), $restricted ) ) {
    wp_redirect( site_url( '/user-registration' ) ); 
    exit();
  }

});

Be sure to not include ‘user-registration’ page id in $restricted array or you’ll experience an endless redirect…