Key your locks alike, then you only need one key! I actually had to find something to put on my house-keyring because it felt so empty being a single key.
The downside to this is if your locks are cheapo pin tumbler locks then if an attacker steals the lock itself it is trivial for them to take your lock apart and reverse engineer a key that works in all your other locks (think crazy ex or wacko, rather than burglar.)
If you key your mailbox padlock and your front door alike and the wacko steals the padlock, they can take it home and figure out the code to your house.
My home has three entry points, one with a porch, and all four doors have keyed alike locks. It’s great!
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