Kia and Hyundai keys suffer from blades that stop flicking out as they should, this is just wear and tear. This video shows you how to fix your key. You'll need a few basic tools plus a pin punch.
The important thing when you fix this key is that you are careful when you remove the green circuit board but more importantly, very careful removing the transponder chip. If you for the chip out of the old case it may break and then your car will not start.