<?php
function user_autologout(){
       if ( is_user_logged_in() ) {
                $current_user = wp_get_current_user();
                $user_id = $current_user->ID;
                $approved_status = get_user_meta($user_id, 'wp-approve-user', true);
                //if the user hasn't been approved yet by WP Approve User plugin, destroy the cookie to kill the session and log them out
        if ( $approved_status == 1 ){
            return get_permalink(woocommerce_get_page_id('myaccount'));
        }
        else{
            wp_logout();
            return get_permalink(woocommerce_get_page_id('myaccount')) . "?approved=false";
        }

        }
}

function registration_message(){
        if( isset($_REQUEST['approved']) ){
                $approved = $_REQUEST['approved'];
                if ($approved == 'false') {  echo '<ul class="woocommerce-info"><li><strong>Sucesso!</strong> Você será notificado quando seu acesso for liberado.</li></ul>';
                                }
        }
}
add_action('woocommerce_before_customer_login_form', 'registration_message', 2);
add_action('woocommerce_registration_redirect', 'user_autologout', 2);