Yes, currently Alexa does not support unlocking the door. Our Alexa Smart Home Skill is currently under review by the Amazon team; once it's released, it will support unlocking.
8 minutes is much longer than the expected latency. Could you try it again and let us know the timestamp so we can check out the logs to see why it's so slow? Moving your Sesame and Wi-Fi Access Point closer together should speed up the process as well. Thanks! - CANDY HOUSE