How to get ants out of a laptop keyboard?

So I was not being very smart and needed my computer outside to check something, and I set it in the grass for awhile. When I brought it back in I noticed some ants underneath, on my desk, or coming out of the key board. Altogether, I probably saw about 10 probably, but I was wondering how I could tell if there were more, if this is a big problem, and how to get rid of them! (For now I have the laptop turned off in plastic bags, hopefully that might suffocate them or something?)