Concommand timer

How could I make a concommand, that when it’s activated it sets the player’s walk speed to 1000 and after 10 seconds it sets it to 300

timer.Simple or timer.Create

and player:SetWalkSpeed() I believe

Yea but how do I make it where
when its activated it sets speed to 1000 and after 10 seconds it sets it to 300 ,I know how to set walk speeds.