Seriously, the door I needed to replace on my old shed had a hardwood frame and structure. My (corded) circular saw, @ 2400W, with a fresh blade, could not fucking make any progress through that timber when I needed to cut it down to dispose of it, and install a new door I made out of some ply / mdf.
It was an absolute horror show going at it with the hacksaw, by hand. I think my right shoulder is still fucked from it almost a year later.
Here, I don't even have a shed and don't really have room for one, either, just shelves, bloody melamine on brackets, mounted on the studs in the garage.