Ember Simple Auth - authorizationFailed not executing session invalidation or transitionTo

Problem: Unauthorized requests do not invalidate session and transition to root url. The default method isn't working so I'm overriding it.

My Custom Authorizer

var CustomAuthorizer = Base.extend({
 authorize: function(jqXHR, requestOptions) {
    if (this.get('session.isAuthenticated') && !Ember.isEmpty(this.get('session.token'))) {
        jqXHR.setRequestHeader('ApiKey', this.get('session.token'));
    }
 }
});

authorizationFailed hook

authorizationFailed: function(session){
  console.log('authorizationFailed'); //displays in console
  this.get('session').invalidate('authenticator:custom', {}); //doesn't invalidate
  console.log(this.get('session')); //still return authenticated session
  this.transitionTo('index'); //doesn't transition
}

I know that the problem is because the invalidation is asynchronous so the promise for the invalidation doesn't return in time for the console.log to spit out the invalidated session. Is there another way to do this?