water damage to part of keyboard
I spilled a small amount of water on the right hand side of my keyboard and now the right hand return and shift key won't work.
MacBook Pro 13", OS X 10.11
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The keyboard is typically the first causality in water damage.— I suspect it will get worse.
You can connect an external keyboard as a work around, while you still have functionality (wireless keyboard needs registering.)
Otherwise take it in for repair:
In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment
Make an appointment for a "hardware issue"—
https://www.apple.com/retail/geniusbar/
If you have AppleCare+ it will cover a large portion of accidental damage.
https://www.apple.com/support/products/mac.html