You're assuming a situation where the AI is alone against all humans.
The AI could get humans to side with it, though. It could promise money, power, etc. So it could be a fellow human who physically prevents you from pushing the switch. And that's also the answer of "how could it control a drone/missile"... persuading humans to grant that kind of access.
If superintelligence is actually achieved, magical (as per Clarke's third law) persuasion abilities aren't that much of a stretch.
Furthermore, a sufficiently advanced AI could bribe someone with things that no human could believably provide. Essentially unlimited knowledge, money, power...
The ability for a human to input information is insanely slow. Like in the tens of characters per second range. You cannot hold individual conversations with more than a few people at once. 3 people talk at once and you lose the ability to process the incoming audio. You read text one line at a time. You have two eyes that focus on the same thing and only have a very tiny high fidelity visual processing space.
In books like the bible they talk of entities that can listen to and respond to all of humanity. Is that outside of the capabilities our computer systems have now? To listen to, catalog, classify, then respond to everything every person on the planet says?
The biblical God isn't restricted to just passive and communication powers, is it? Godlike powers include active abilities way beyond human capability. What is often brought up in the context of AGI is the ability to persuade anyone of anything, ability to solve biological or physical problems beyond our ability or comprehension, entering any system undetected - not even sure a precise definition is needed as it usually boils down to what looks like magic to us.
The AI could get humans to side with it, though. It could promise money, power, etc. So it could be a fellow human who physically prevents you from pushing the switch. And that's also the answer of "how could it control a drone/missile"... persuading humans to grant that kind of access.