Unless you go to a super professional locksmith shop nobody cares. I have had these kinds of keys copied multiple times and prepared an elaborate backstory about being sent by my boss and they didn't even ask either time. They didn't even look or notice.
If they do ask and you don't want to lie just go to the next hardware store over. They can't keep your keys or hold you or anything for trying to get a key made, at worst they will say no.