Praise be to Allaah.
We put your question to Shaykh Muhammad ibn Saalih al-‘Uthaymeen, may Allaah preserve him, who answered as follows:
If you fill out the papers for them, then you are helping them to do something which is haraam, and Allaah says (interpretation of the meaning): “but do not help one another in sin and transgression” [al-Maa’idah 5:2].
What if they are faced with a threat to fire them from their jobs?
We still advise them to refuse to do this. “And whosoever fears Allâh and keeps his duty to Him, He will make a way for him to get out (from every difficulty)” [al-Talaaq 65:2 – interpretation of the meaning].