Using traj package for clustering a set of rows

Question

I have a dataset that contains the observations of 30 people and each of them had done 20 experiments. But for simplicity let's assume I have a dataset like this:

ID     trial  response  reaction_time
"s1"     1        0         2.52
"s1"     2        1         3.12
"s1"     3        0         2.66
"s2"     1        1         1.42
"s2"     2        1         2.01
"s2"     3        0         1.20

I wanted to cluster subjects and because I have longitudinal trajectories, I thought of using traj package. But I think this package doesn't cluster a grouped data. Right? What should I do to cluster my data based on subjects?