Set up mobile vaccination sites - you have the keener's who want the vaccine and will do anything to get it including standing in line and the middle that will take it if it's convenient and the deniers who won't take it at all - the only way to meet the middle group is to show up outside their place of employment or their homes. That's why we always got our shots at school - it was too much work for the parents to take us to the doctor's office.