Is it easy to make a copy of a key?

I want to give someone a key to the house to feed my pets while I'm away for a few days. but I'm wondering if it is easy for them to make a copy of the key in secret? I know this sounds insanely paranoid but one, I am paranoid lol and two, I don't trust this person as much as my boyfriend does so.... show more I want to give someone a key to the house to feed my pets while I'm away for a few days. but I'm wondering if it is easy for them to make a copy of the key in secret? I know this sounds insanely paranoid but one, I am paranoid lol and two, I don't trust this person as much as my boyfriend does so. I'm just wanting to know if they could easily make a copy of the key and use it to come in my house in the future, or if this is something very difficult to do they likely couldn't? thanks
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