I researched three alternatives for keys.
Iris Recognition
Good point- Very accurate.
Bad point - Costs a lot of money.
Password code
Good point- It’s very simple, and cheap.
Bad point- People can hack it, and you might forgot the password.
Fingerprint
Good point- There is only one kind of each pattern of fingerprint in the world, so others can’t hack into your home.
Bad point- You’ll be mistaken if your thumb got a cut.
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