Need help whit cutting object in animation

So here is my problem i what the lightsaber to cut into the box in animation and leave behind the cut.
I tried to use dynamic paint (displacement) and it doesn’t make result i want it doesn’t make perfect cut.
Then i found Boolean modifier but i don’t know how to animate it so that I’m not key framing each frame 1 by 1 and not applying it to each frame.
If you have some suggestions i would be really happy if you could help thx…

You can create the cutting process using boolean difference with the cutting object being invisible. Here is a simple example, Press Alt-A to play.
boolean_cut.blend (543 KB)

Thank you soo much for help AlanK <3