Walmart (NYSE: WMT) is implementing new ways to boost sales and overcome delivery challenges that arose during the pandemic. The company said customers who place orders will have it delivered at their doorstep in a contact-free manner. This is one of the retail giant's several autonomous vehicle pilot projects, which will help it find new ways to augment retail sales. The company began express delivery in April. The service is now extended to more than 2,800 stores across the U.S., reaching over 65% of American households.