How can I make the user jump to another link, after using "exit;" to prevent access to a user limited page?

Question

I have a page that I want to be limited to specific users. If the user at interest does not have the permission to access the link, I prevent access by using "exit;" as seen below.

        if (!in_array($_SESSION['id'], $ACL)){  
            echo "<script>alert('Wrong Account')</script>";
            exit;
            header("Location: link.com");
       } else {
            echo "<script>alert('Correct Account')</script>";
       }

Once the user is rejected from the link, I want it to jump to the main homepage so that they can sign in again. For this, I think that header(); should work, however does not seem to be working after exit;ing.

I feel like even without the exit;, just the link jump will prevent access. However, I'm not really sure if this is safe from a security perspective. Is there an alternative method? or is just the link jump enough?

Thanks in advance.