An aftermarket shop (that installs stereos, speakers, engine remote start) can add add power locks. They have aftermarket kits that are universal. Probably wouldn't be hard to do it yourself if you get the right kit.
Or heck maybe even call a Kia dealership and see how much they'd charge, but it'd probably be way more.
My 2011 Focus has crank windows and manual mirrors, but it does have power locks. came with the remote lock/unlock/trunk open (keyless entry).
Here's a YouTube video of a $25 kit to add power locks. $25?!?! Wow, I'd probably try to get a better quality kit -- maybe a $50 one. lol. But this $25 one might be ok.