I am going to invoke the XKCD comic on you in return.
I work in a library. I help people with computer issues every day on their personal computers and the public ones...
99% of people would freak out if you expected them to know what Task Manager even is, let alone what it does or how to open it.
This entire conversation is vastly overestimating people's abilities and confidence when it comes to computer use.
In Australia this is a standard practice. It's technically an "informal vote" or a "spoiled vote" but its colloquially known as Donkey Voting. The traditional method is to actually just draw a big dick on the paper, though.
And no one has been, or ever will be, fined for this. We don't even, in practice, have compulsory voting. We have 'Compulsory Turning Up To Your Opportunity To Vote'.