Tbh im not 100% sure how they will with the sil (but then again I dont know all of the tricks they can use ....... other than a hammer or vacuum :/
The doors will 100% need replacing (or at least the outside skin :/ )
They'll weld little pins on the the sill and then use something to pull the metal out.
They may well fix your golf though, the doors have replaceable outer skins so they won't even need a whole door. That work could be done pretty quickly so the courtesy hire isn't going to cost them much either.
Annoying thing with skins is they never get sealed properly and end up rusting after a few years.