Earlier quoted context omitted.
Sorry, but $20K per door is still ridiculous. This is not new technology, automatically operated doors are used in many different settings. It's pure gov't waste to pay that much. It would be wasteful if it was 1/4 that much.
As an example that most automatic doors don't have to deal with, but is essential for railways: The door must detect a 1-2cm obstruction (e.g. fingers, child's wrist) and be sufficiently weak that a child can pull their hand/wrist free. The door must not prevent a train from departing if only a hem of a skirt/trousers/coat is trapped. They must be strong enough to prevent anyone falling from the train while it is in…
The first part just means they need to have rubber padding. Still expensive since the design it's a one time job and can be reused for trains, trams, buses etc.