Entity with Model finder (custom setters)

Yes, that's right, immutable data.
But how do I apply my class properties?
private $password

solved a problem

PHP Code:

    public function getPassword(): string
    {
        return $this->password;
    }

    public function setPassword(string $password): self
    {
        $this->password = $this->attributes['password'] = $password;

        return $this;
    } 


or otherwise, but I can't set private class properties - that's the main problem

Simple CI 4 project for beginners codeigniter-expenses