I absolutely don’t recommend you try this, but I put mine face down on a hard flat surface and stand on it until the boot process reaches the Nokia tone and this usually works. However, success has become less and less frequent with this method. To be fair to the build quality of the phone, it can take being “flattened out” without complaining.
This is your last ditch effort to rescue your data before finding a proper repair! Other damage may result! I probably shouldn’t have mentioned it!