How to tell if a power strip is burned out?

I have a 6 outlet power strip I use near my desk that only powers 3 items, a space heater and two lamps. Both lamps are fairly low wattage, one powers a 60 watt bulb and the other a 25 watt.
Just now all 3 items went off and the power strip is very hot, including the plug itself and the light is off and the switch will not work. It is frozen.

I have unplugged everything but am wondering how do I know if the power strip is damaged or burned out? Will it reset itself after it cools down? I have never had an issue before although I did run the space heater for 8 hours yesterday. Could that have overloaded the power strip? If one outlet burns out does that make the entire power strip malfunction?