can't reset oil change light on 2004 GMC Envoy

can you give me any hints why my change oil light won't reset, i have followed the owners manual for this and it won't reset...thanks

Asked by for the 2004 GMC Envoy
with the key in the on position, not running, depress the accelerator pedal to the floor 3 times in 5 seconds. the light should blink and go out.

this is ernest , what if the lite doesn't go out . only after you start-up an running for few seconds
thank you for the reply,,,,,,,,,,,,i did get it reset.....thanks again
i have the same problem and have tried multiple times per the instructions - any further tips?? i got it now too - my problem was i was following the directions and returning the key to the lock position, rather then just waiting after the 3 pedal presses in 5 seconds to see the light flash and go off while still in the 'on' position - thanks - that piece helped me solve it