I have a 2010 Ford F1 50 lariat 4 x 4 with 94,000 miles on it. The keypad on the door has worked up until now . The second number and the code is an 8 and when I hit that button the door locks it will not allow me to get the other two numbers in.I have tried the factory code the second number in the factory code is 7 and it does the same thing any ideas?