You cannot make a hen go broody. It totally depends on her hormone levels.
Hormone levels depend on her genetics.
Genetics depend on her breed.
Be aware that commercial layer lines have been carefully selected for egg production which means they have also been deselected for brooding as brooding isn't laying.
Very few commercial layer types will ever brood. (It happens...sometimes you get one...but it is uncommon).
As to those breeds that are genetically predisposed to brooding? (Think Silkie, bantam Cochin, Game, some breeder quality Buff Orpingtons, breeder quality Marans), well, you can encourage those lovely genetic hormones which are always bubbling in the background to kick in by providing a warm, quiet, isolated, dark nest, with a clutch of fake eggs to sit upon.
The warmth, darkness, and solitude relax the hen, and the pressure on the breast bone literally helps release hormones from the pituitary gland that encourages brooding.
But only if you have a predisposed type. I could literally throw my Silkies into a brood with the right handling...but they were always almost half brooding most of the time. Other larger fowl are seasonal and nothing helped out of season. (April through June is usually high season).
And yes, setting eggs under a brooding hen is incredibly easy. Momma does all the work.
I intentionally bought Silkies and Bantam Cochins to form a brooding stable so I would have somebody going broody almost any given time. Others use Games.
My experiences.
LofMc