Baby Gate that 4yo can open ?

DS needs a little bit of space that his little sister cant destroy. DD has recently started walking and is into everything, poor DS is getting frustrated, especially when his set up his toys in the play room and his Godzilla like baby sister walks in and destroys it all in one fell swoop.

So we are going to move his lego table and cars into his bedroom and want to put a baby gate on the door so she cant get in :D We have a few gates in our kitchen already, DS cannot open them without out help. Are there any about that a 4 yo would be able to open himself?

Miss 4 can open our Dream Baby gate fine - it's a lift mechanism.

Thanks babe, off to google

We had one from target that was good too. It was their own brand, same kind of thing the girls could open them but not ds.