How to fix my car door locks?

I have a '93 ford truck I bought it and my keys don't unlock the door
I have two keys one for the back window and one that works for the ignition
the back window key doesn't even fit
but the ignition key I thought was the key for the door as well will fit in the key hole but won't turn (driver or passanger side)
I can lock and unlock the doors from the inside
but the keys don't work so I can't lock it when I leave it
and I don't know even how to start fixing the issue
should I go to an auto shop? Lock smith? Can I fix this myself?

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