You have 2 options. First is plan A- You can have a lock smith come out and cut a key for the lock. It takes about 30 minutes- 1 hour and if you don't have AAA or insurance, its like $70.
Now for plan B
Your second choice is to buy new lock cylinder and key sets and install them yourself. This involves pulling off the steering wheel. As a safety feature, Ford made it so that you need to have a key in the lock and have it turned to the "on" position to pull the lock out of the steering column. And since you don't have the old key to remove the lock cylinder, you may have to use a drill to drill out the lock tumblers before you can remove the old ignition lock.
The good news is that the trunk isn't nearly as hard, as you won't need the old key. To get into the trunk, you can to go in by laying down the back seats and opening the trunk from the inside. There are only a couple of screws and a clip holding the lock cylinder to the inside of the trunk lid.
So, if you want to take the easy way out, get the locksmith. If you want to save a little of money, kill some time, and get new locks in the process, take plan B.