ją

accusative singular of ona

do

1. denotes allative movement; to, toward
2. denotes illative movement; into, in
3. denotes purpose; for, to
4. denotes the subject of an address or action; to
5. until, till, to
6. up to, as many as
7. denotes a deadline; by (indicates an intended deadline)

drzwi

1. door (portal)
2. door (means of approach or access)