If i took keys to a lock smith could he make me a master key?

If you want your keys to work all of the locks just for convenience , barring a pinning miracle , you are going to have to pull the locks off of the doors. If you are shooting for convenience and one key will fit into all of the locks but not turn , find the key that works the most locks and that's what you'll try to pin everything to. Either pull the rest of the locks off and bring into a locksmith with a key. Or you can look for a rekey special where the locksmiths come to your home for a discounted service call. Either way you are looking at $8-$12 a lock for a locksmith or $5-$10 for a handyman to rekey the locks. As long as one key fits in all of the holes and the locks work propely you won't need new locks. That being said if the knobs are residential grade and older and not a hard to find finish , replacement might not be much more expensive.