…what? With the exception of mage hand legerdemain, you’re typically very close to locks you’re picking. If it made an anti-magic field like 6" from the ring, that would be perfectly fine for picking the lock. Ring is on hand, lockpicks are in hand, magic lock is disabled.
It wouldn’t work on a magical lock if you had to hold it up to it all the time
…what? With the exception of mage hand legerdemain, you’re typically very close to locks you’re picking. If it made an anti-magic field like 6" from the ring, that would be perfectly fine for picking the lock. Ring is on hand, lockpicks are in hand, magic lock is disabled.
Even touching them with your hands or with the tools in your hands, I’d say. And thieves tools aren’t like several feet long or anything.