how to do something every certain peri0od unity code example

Example 1: unity call a function every x seconds

float x = seconds before the first invoke;
float y = seconds between every invoke;

InvokeRepeating("Function", x, y);

Example 2: unity do task every x seconds

private float nextActionTime = 0.0f;
 public float period = 0.1f;
 
 void Update () {
     if (Time.time > nextActionTime ) {
        nextActionTime += period;
         // execute block of code here
     }
 }