There is no knife do not have to be re-sharpened in the world. Every single knife has to be re- sharpen after use because the edge worn out and you cannot keep the sharpness without the maintenance.
Using sharpeners or sharpening bar is very easy, however, it cannot get the original sharpness back because it is just temporary repair.
We highly recommend using whetstones for re-sharpening. You may think it is hard but actually much easier than you think. Why don’ t you try with a knife you don’t need.
Tojiro Whetstone Series
Simple Sharpeners / Sharpening Bars