[LWJ]

I vote block plane. I have a number of these and they are one of my favorite tools.

Other options would be a simple orbital or belt sander. I would prefer orbital even though it is slow. The results would be better.

The router is a lot of power and opportunities for error - including your hand. If you just have a router table, I will assume it is a smallish one. Even less safe.

Go slow. Go careful. Be clever about this not impatient and you might save your drawer and your hand.

Good luck.
Larry