CT is right. Not all chickens like to be handled or even touched. Follow the recommended "treat" protocol, and in a few days, you'll know which ones are candidates for corruption.
One thing I've noticed, potential candidates will hand out close but just out of range while I'm indulging in love fests with the friendliest ones. They're observing the treatment these friendlies are getting, and they're very curious about it. Those are the ones you want to focus on.
Don't be a big hurry. Get comfortable, relax, and grasp a raisin between the tips of two fingers. Make the hesitant ones work hard for bites from the single raisin. As they're completely absorbed in whittling away at the raisin, slowly touch their breast. Touching their back comes much later after they trust you. Keep feeding one raisin at a time while touching and stroking the breast.
After a few days of that, you can graduate to holding the treat in close to your body and making the chicken stand in your lap for it. By that time, you will probably be able to bring in your arms and hold the chicken while you deliver the treat. Stroke face and wattles and comb. especially the ear lobes, as those are sensitive areas and they adore having them stroked.
Use their name while you engage in this training, and you may be able to get them to learn their names and to respond to you when you call them.