Here are some examples:
* "The lawyer invoked the Fifth Amendment to protect his client from self-incrimination." - This means the lawyer used the Fifth Amendment as a legal defense.
* "The ancient ritual invoked the spirits of the ancestors." - This means the ritual was designed to call upon the spirits.
* "The software invoked an error message when it encountered a problem." - This means the software activated a specific message to signal an error.
In general, "invoked" implies a deliberate action taken to bring something into play. It can also suggest that something is being called upon for help or protection.