How do you put UPVC doors on 'latch'

[hobbgoblin]

DC are playing in front garden and keep banging on door to be let in preventing me from getting ANYTHING done, save for in 2 minute bursts!

I've never had UPVC doors before so not sure how they work

I know you can lock from inside by raising the handle upwards, and this was a revelation, but how does one put on latch iyswim?

I mean so they can get in and out but that the door stays closed.

Don't think you can. I always carry my keys with me in case i get locked out.
Don't think i'd want a door that did not lock automaticaly ANYONE could walk in.

You just shut them without locking, then they open when you pull the handle down.

The one i have doesn't do that. Can only open from the inside. No handle on the outside.

oh, can't be done then. I'd either leave a key in the lock on the outside for them, or open it, lock it and then it wouldn't completely close.