You have to prove that you are the owner of the vehicle, car or building that the locksmith will unlock. A copy of your home deed, your car title, or other documentation that indicates you are the owner of the building or car will be sufficient to prove ownership to the locksmith. Unfortunately, in most states the answer is no, but all credible locksmith companies will ask you to provide proof of ownership before letting you in. Naturally, no locksmith wants to be a tool in the hands of someone who wants to enter a building that is not their property.
That said, it's worth a try, mainly because it's something a certified locksmith is committed to doing so as not to end up breaking the law. In most U.S. states, a locksmith or a locksmith company doesn't need to legally verify property or property rights. However, no credible locksmith service will allow you to enter without verifying your identity and your link to the property.
To verify the ownership of a safe, the locksmith will verify that you have access to the property where the safe is located. That said, a credible locksmith company should be able to work with you to verify your identity before letting you in. In fact, if you hire a locksmith who doesn't ask you for this, it's a warning sign that an inexperienced and unscrupulous person is about to take the price away from you. What you need is what state law requires a locksmith to confirm and validate it before giving you access.
And that's what the other locksmith companies, those that allow anyone in without needing to prove ownership or access rights, aren't doing for you. That's why, as standard operating procedure, all locksmiths in North America begin by verifying the identity of the person who hired them. That said, if a locksmith company doesn't verify your identity, it's a warning sign that you're now an uncertified and even unqualified locksmith. While the additional steps that locksmiths take may make the property owner feel uncomfortable or indecisive, it benefits those who own the property.
In any case, there are countless cases of impersonators hiring a locksmith to access someone else's vehicle or home.