How can I make SSH with an identity file always demand a password?

[matthewhtb at danwin1210.me]

Hello,

I hope my question is apt for this list.

I am using OpenSSH_8.2p1 on Ubuntu 20.04.

I connect to a remote SSH server with the -i /path/to/file identity file
option. My local machine asks me for a password for the identity file.
This is because I created a password when using ssh-keygen.

However, after I exit from the SSH server, and log back in I am not asked
for a password. Some kind of caching is happening.

Is there a way to force the password to be asked on every occasion when
using an identity file?

I have searched but it looks as if everyone wants to avoid using
passwords, not deliberately attempting to use them.

Thank you.