Everyone has a thumb-screw: a hidden need or fear that moves them more than their public principles. Find it, and force becomes unnecessary.
Watch reactions. Notice what they boast about, what they avoid, what makes them defensive, and what makes them rush. Strong emotion usually marks the lever. People speak loudly about what they want to protect.
Once you know the lever, apply pressure with precision. Offer the reward they crave or threaten the loss they dread, but do it quietly. Never look like you are exploiting them. Pride resists control even when desire obeys it.
The goal is predictability. If you know what someone cannot tolerate, you can forecast their choices before they announce them. Then you can arrange the room so their “decision” has one easy path and several painful ones.
This is why the thumb-screw matters. It turns persuasion into engineering. You stop arguing with surface opinions and start moving the deeper mechanism underneath. When you pull the right lever, the person moves themselves.