20A home circuit breaker stuck in "TRIPPED" state
If you cannot move the circuit breaker actuator from the "tripped" position to the "off" position and have it stay there then there is certainly something wrong with that breaker. 

You should definitely plan to replace that breaker with a new one as breakers do fail from time to time. But first you should evaluate what it was that caused the breaker to trip in the first place. If that is comprehended and corrected then install the new breaker.