passenger side door

ok i managed to fix my drivers side door. it took me about 2 hours because after taking the panel off and tightening the plastic thing that connects to the outside handle, another plastic thing connected to the rod to the inside door handle broke off, making the rod come loose. had to bend the bar so the hook stayed on there. after that i decided to try and work on the passenger side and rear hatch locks. when you put the key in it doesnt turn. its just stuck. i tried spraying wd40 in it but it still didnt work. probably gonna take that door apart tomorrow or whenever i get the chance. what should i be looking for?