From the picture, this really looks like soap locust.

The following is a picture of Saponaria saponica, you can refer to it

Saponaria locust is one of the unique tree species of the genus Saponaria in the family Sumyaceae in my country. It should be in the shape of a scabbard, slightly curved, and 100 to 400mm long. , about 40 mm wide and 10-15 mm thick. The surface is reddish brown, covered with gray frost, and the seeds are raised. The two ends are slightly pointed, the base gradually narrows and curves, there are short fruit stalks or fruit stalk marks, and there are obvious longitudinal ridges on both sides. Most species, flat oval, yellow-brown, smooth. Hard quality. It has a slight odor, is irritating, and has a spicy taste. The complete thorns are often branched, and sometimes divided into small branches. The thorn ends are sharp and the base is flat and cylindrical. The total length is about 10cm or longer, and the diameter of the base is 0.8-1.2cm. The surface is purple-brown or reddish-brown. Light body, hard texture, yellowish-white wood on cut surface, loose pith, brown, odorless and light taste. Habits: It likes light but tolerates a little shade. It likes a warm and humid climate and fertile soil. It is also tolerant of cold and drought. It has no strict requirements on the soil.