Removing a Product From The Cart Programatically In WooCommerce

functions.php

<?php
add_action( 'template_redirect', 'remove_product_from_cart' );
function remove_product_from_cart() {
    // Run only in the Cart or Checkout Page
    if( is_cart() || is_checkout() ) {
        // Set the product ID to remove
        $prod_to_remove = 56;

        // Cycle through each product in the cart
        foreach( WC()->cart->cart_contents as $prod_in_cart ) {
            // Get the Variation or Product ID
            $prod_id = ( isset( $prod_in_cart['variation_id'] ) && $prod_in_cart['variation_id'] != 0 ) ? $prod_in_cart['variation_id'] : $prod_in_cart['product_id'];

            // Check to see if IDs match
            if( $prod_to_remove == $prod_id ) {
                // Get it's unique ID within the Cart
                $prod_unique_id = WC()->cart->generate_cart_id( $prod_id );
                // Remove it from the cart by un-setting it
                unset( WC()->cart->cart_contents[$prod_unique_id] );
            }
        }

    }
}