The US vaccination plan is state by state. In many states people working in food service and grocery stores, people under 60 who are overweight, have high blood pressure, asthma etc... will be offered the vaccine in phase 2. It’s not just doctors and the elderly, it’s a huge chunk of the population.
And depending on how many people actually want the vaccine and how many are approved it’s possible that healthy, under 65, non essential workers could start being offered the vaccine.