A long time ago you would find Schlage wafer door knobs on plenty of residential doors but they are now something of a rarity, because they stopped making them decades ago.
Still, they pop up from time to time and they don't pick quite as easily as you might guess. This is where the magic little SA-01 lock pick set comes in handy. This tool, or rather set of tools, works like a charm and is super easy to use. In fact, it's not like picking a lock at all. When you insert the probe into the keyway the lock is half picked! Just choose the right 'key pick' for the keyway (double or single groove, right or left orientation) and slide it into the keyway above the probe, then pull it out smoothly while maintaining a little turning tension.
The lock will pop and it's unlocked.
I've NEVER had this tool fail me, and in my 30 years of Locksmithing I've used my SA-01 plenty of times.