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your best chance vs a lock is to use spell reflect and hope like hell that the lock crits themselves, they can put up their shadow ward as the spell is flying back at them to mitigate some of the damage though (tested it myself)
You act as if warlocks=death to warriors. most warlocks only rolled the class because everyone complained about how OP it was and never bothered to learn their class(just like rogues). As long as you stay on top of your pummels and fear breakers, you should be fine. I can't remember so someone can verify this but if shield bash is on a separate CD than pummel a macro for quick swap+def stance+shield bash can be set up to completely ruin any caster's **** if you are still having problems. Just remember to have a separate macro(or the same one if you want) that will let you swap back to whatever big damaging weapon(s) you were using.
Learning to use everything in your ******* is key to getting the most out of your class. Not having to use it all is just a benefit of experience.