Add slock to pam unlock

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1

I am using NixOS. I want to use pam-gnupg with slock. How can I make unlocking slock also unlock my gpg key?

Part of configuration.nix:

programs.gnupg.agent = { enable = true; enableSSHSupport = true; };

security = {
  pam = {
    services =
      let defaults = {
            gnupg = {
              enable = true;
              noAutostart = true;
              storeOnly = true;
            };
          };
      in {
        login = defaults;
        slock = defaults;
      };
  };
};

Part of home.nix:

programs.gpg.enable = true;

home.file.".pam-gnupg".text = "6869706F69657774726F736B696B646E74736972";

services.gpg-agent = {
  enable = true;
  defaultCacheTtl = 54000;
  maxCacheTtl = 54000;
  extraConfig = ''
    allow-preset-passphrase
  '';
};