If you lose your only passkey, changing the key is your only option. You will need to turn to a reliable and experienced local locksmith who can make new locks for you.
A skilled locksmith makes keys by hand without the need for real keys. The price will likely depend on the type of door lock and the time it takes to make the new lock. You can also search for the best key lock replacement services from online sources.
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Before hiring a locksmith to replace your home keys, make sure that your lost keys can easily be returned to your property. If possible, you may wish to change your lock. It costs more than an inexpensive key replacement but gives you the peace of mind that no one can access your home with your lost home key.
It's also worth noting that lost keys can invalidate your home insurance. If you lose your home key and someone uses it to gain access and rob your property, you may not be able to sue.
The problem is, your home insurance company is telling you that you haven't taken appropriate action to protect your home. Many politicians ask for proof of forced entry before they are ready to pay their claims.
If you want to change the lock completely, the locksmith can try to open or penetrate the lock to gain access. Then they'll change the locks and cut you a new set of keys.