Locking on a target by rotation

I’m having trouble thinking of how to make a radar (Basically a sphere) locks an enemy slowly.

Just like locking on a target in Flight Simulation games like Ace Combat?

Use quaternion.slerp

You can use Vector3.MoveTowards

Simple example:

transform.position = Vector3.MoveTowards(transform.position, target.position, followSpeed * Time.deltaTime);

I hope this helps.