How to destroy a LOOK pedal as it won't come off anyway
Heating the pedal is not going to help here.  Cool the pedal might.  But if the hex is stripped too late.  

Use penetrating oil like Liquid Wrench over WD40 for this. 
I would have soaked it two days in penetrating oil before I went brute force.
The risk of brute force is you that you strip out the crank. 

Use a drill press as it is really hard to center by hand. 
If you get the bit big enough it will fracture the pedal axle.
But you don't want the bit big enough to scar the crank.

I would see if you can get the pedal part of the pedal off and have enough of the axle to grab on to with a pipe wrench.  Soak it for 2 days in penetrating oil before you go at it with a pipe wrench.