Not quite sure what you mean by handle latches - dogs that swing out of the door as in a manually operated door. I think every hydraulically operated door I've seen has been secured by pins. Its mechanically very simple and easy to set up proximity switches to verify the pin's position. One mistake I have seen is where the tip of the pin has no chamfer - if the door is not well aligned the pin jams against the door rather than slipping into its hole usually resulting in a large bang and bits of metal flying off.
Might want to post a photo of exactly what you mean.