What you're looking for is a little more substance to it, and honestly, I'd be all for it. However, why not just automate? I'd personally prefer if your character actually went through the motions of using his little hacking device to open up the door. You can still have the little bar, and of course it'd take no action on your part aside from holding down the button, but watching your character snip some wires or whatever would contribute toward the suspension of belief, and couldn't hurt at all. Only thing I'm against is making it into a puzzle that people would need to be good at to over-complicate such a minor thing as hacking.
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