You should feel some resistance when operating the latch. There is a small spring in there which may have come out of place. I had this problem for quite a while, and one day took some time, took it apart and fixed it. It does require some patience. It also may not immediately appear obvious how to put it right. VERY carefully disassemble, taking careful note of how and where parts are, so you can get it back together correctly. It has been quite some time since I fixed mine, wish I could be of more help. The thing that stands out in my memories of this job, is the fact I looked at it a long time before I had it figured out.
Go slow, take care and good luck.

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Mike.