Replying to Bindings Are super hard to open

So I have rossi scratch 140ti bindings from 06/07 and I haven't gone skiing in nearly 2 seasons due to multiple ACL tears and surgeries. So anyway, I went to check up on all my gear and When i popped into my bindings, I couldn't them off. I had to use all of my 225 pounds to get them open and just forget about using my poles to get them open (which I usually do) because it was way to hard. There is no way that this is normal. They're set to 11 din. So what could be my problem? Do they need like grease or something?