Turn matt emulsion into silk/satin ?

So i need a touch up paint for my hallway, however it seems pointless buying the 2.5L tin of silk paint for £18 when i can get a 50ml touch up paint for £1.20 as thats all i need.

Only problem is, the touch up paint comes in a matt finish only.

Is there a way to give it a shine? maybe adding varnish or even lacquer?