You tell us - since that isn't even part of the process. The protein doesn't "enter" a cell in the vaccination process.
There are multiple sets of experimental results showing either lipid nanocapsules, or spike protein, in the blood, or in tissues, all over the body, following the injection.
In mice, in living humans, in human autopsies.
Your assertion that the protein doesn't "enter" the cell in the vaccination process is WRONG. It disagrees with experiment.