how to disable player inputs?

I would like to disable player controls when it enters an area with a trigger!

Here is some rough pseudo code, but it should point you in the right direction.

public static bool PlayerControlsDisabled = false;

private void OnTriggerEnter(Collider other)
{
    PlayerControlsDisabled = true;
}

private void OnTriggerExit(Collider other)
{
    PlayerControlsDisabled = false;
}

You can then in your PlayerControls check if the bool is true or not

if (yourscriptname.PlayerControlsDisabled == false)
{
    // Player controls in here
}