When I set the brightness to the minimum it stays at zero visibility, which seems to me as a calibration error.
It's very frustrating if you don't have keyboard shortcuts to increase it again.
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If you can adjust brightness it probably means you are using a laptop (correct me if I'm wrong). If you are on a laptop you can adjust brightness using the function key combinations (e.g. Fn+F4).
On desktop it probably not directly possible - usually depends upon the monitor you're using. Check for on physical buttons for options like auto-calibration etc.
Get the connected monitor:
xrandr | grep " connected" | cut -f1 -d " "
Adjust the brightness (for output =
xrandr --output VGA-1 --brightness 0.5
As for keyboard shortcut you've mentioned you can create custom shortcut using the above command here: