How should I ask for a raise?

So I just became a lead 1.5 months ago and I'm very happy where I'm at. I work at a food manufacturing.

So recently I've been given 3 rooms to watch over with only me being the one in charge. I have no problem because I've done all these rooms before and know every product we do.

I just got told by my supervisor, I'm getting one more room to watch over, it's a completely different room. I've never done anything in that room but just look at it from the outside. I feel as if it's way too much to handle with the pay I'm getting.

I'm not too sure how to ask them for a raise or when too. I've gotten too many guys to watch over and I cant be at all places at once

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