The raw, artist-constructed DUMBO loft I lived in in the ‘90s had a pocket door for the bathroom. The “handle” was simply a hole drilled completely through, and capped on either end with a small metal piece that looked like the smaller of these:
That thimble-like piece was barely enough to get one finger into. Other pocket doors I’ve seen typically have larger handles:
I’d never seen these made of anything but metal. But I’ve just learned an Australian company called Tirar makes handles for pocket doors (cavity doors, in Aussie-speak) made from handsome wood:
The one above is made of American White Oak, but they also offer it in American Walnut:
I think they’re a darn sight better-looking than the metal ones, and I’m guessing they feel nicer in the hand. They come in three different thicknesses, and you can order a custom thickness as well.