I don't think so. That is an awfully large boost to power when a rogue can suddenly disarm traps from that far away. And to be honest, I probably wouldn't let him do it anyway for a couple simple reasons: A lot of lockpicking is done by feel, not just by dexterity, i.e., you can feel out where each of the pins are, know when they are in the right position, etc. The second reason is for disarming a trap. When you're 30 ft away trying to disarm a small trapped device, it's going to be difficult if not impossible to see what you're doing. Disadvantage then would be generous!
It is assumed that the rogue has all the tactile capability necessary to do the tasks through use of the mage hand. It is a special use of the cantrip that only an Arcane Trickster has mastered.