https://www.theguardian.com/technology/2017/oct/25/amazon-key-system-will-allow-delivery-drivers-to-unlock-customers-doors

Couriers will be able to gain entry to properties, watched by the recipient on their mobile phone

Would you let Amazon unlock your front door? That will be the question facing consumers after the online retailer launched a service allowing couriers to open customers’ front doors and leave deliveries inside.