How to change the position of the Gameobject in 10 second?

I want to change only Z-axis
(((Details of my gameobject
Name: Finalride
Tag: Pipe
Position: X-axis:0 Y-axix:0 Z-axis:4)))
My Gameobject(finalride) had Z-axis=4 I want to change it to Z-axis=1 in 10 second after game starts and again after 20 second i want its position to be Z-axis=4
HOW DO I DO IT? ANY IDEAS???

Take a look at the Invoke page.