Actually, this is the kind of complexity and misunderstanding that makes software more difficult to maintain.

If you step back and understand that the problem is the method name is not clear, creating more code to get around that is totally unnecessary - just fix the method name. The other repliers hit the nail on the head with better options.

I personally would opt for the renaming of the method first:

    $this->executeAfterSeconds(5);

If it was a third-party library or I was able to refactor the method itself I would go for constant named after what it represents, rather than what it is:

    $this->executeAfter(FIVE_SECONDS);

As a last resort (like if you had some reason why would couldn't physically change the source) a comment would also be totally acceptable.