My understanding of the two spells is that a 3rd level wizard can KNOCK her way into a 20th level wizards ARCANE LOCKED door.
I don't see any spell of higher level that can be used for locking doors...I mean, you could get creative with illusions and transmutations for sure.
I was thinking of 'rectifying' this problem by requiring a caster check for KNOCK similar to DISPEL MAGIC, but with a +10 or +5 (otherwise knock would be pointless, and one should just memorize dispel magic...)
I don't see any spell of higher level that can be used for locking doors...I mean, you could get creative with illusions and transmutations for sure.
I was thinking of 'rectifying' this problem by requiring a caster check for KNOCK similar to DISPEL MAGIC, but with a +10 or +5 (otherwise knock would be pointless, and one should just memorize dispel magic...)