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Since in the mid-late game almost every party will have at least one caster that can cast the knock knock spell at power level 7.
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A level knock-knock not necessary opens a lock. For high-level locks, sometimes 4 level 7 knock-knock spells (from different casters) are not enough. But combined with 2-3 casters, a skill of 10-20 is enough (which you can get from items).
But since your gadgeteer has nothing else to do, raise it. At least in ironman, its well worth it (just lost $70.000 to the chest at Barlone).