Wp - Custom sorting products WC

Hello,

I’ve a woocomerce installed on the latest platform.
On my wp_post table i’ve insert a custom row, containing a date for the sorting named boost.

Could i:
Show the products with the boost date first and display after other products by date post ?

I’ve tried this:

add_filter('woocommerce_default_catalog_orderby', 'changer_orderby');
function changer_orderby( $sort_by ) {
return 'boost';
}

But that doesnt work and what i want.
I'm searching anyone able to solve this.

Kr,
M.A