How to generate masquerade link programmatically

The Masquerade module allows website admins to switch users and visit the website as that user. This is helpful for developers and site builders when trying to find out what a client might see when logged into the website. To create the unmasquerade programmatically use this:

if (
  \Drupal::moduleHandler()->moduleExists('masquerade') && 
  \Drupal::service('masquerade')->isMasquerading()
){
  $links['unmasquerade'] = [
    '#type' => 'link',
    '#title' => t('Unmasquerade'),
    '#url' => Url::fromRoute('masquerade.unmasquerade'),
    '#weight' => 1500,
  ];
}