Short answer: yes.
I have a couple of pairs – one all metal pair, now blunt, and one plastic-handled pair. Both used to belong to my mum so I don’t really want to throw them away.
Apparently you can sharpen them by cutting through a folded sheet of tinfoil so sweet, I can hang on to them.
As it’s late and I can’t be arsed to do it now I’ll give it a go tomorrow and report back 🙂