My lock button on my iphone is stiff suddenly?

I have an iphone 5 that i got not too long ago and suddenly the top lock button has got really stiff when pressing it down and doesn't click anymore.

I spilt a bit of tea on the side of my phone the night that it started to mess up so i'm thinking it may be that? Water damage?

How can i fix it because i've used a needle to try and gather any dirt from around it but there doesn't seem to be any anymore.

Will apple fix it for free or is there something i can do?

If it is under contract they will fix it for free but they will charge money if it isn't under contract.

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